L - Living Statue, Giant Lizard, Lizard Man, Giant Locust, Lycanthrope
M - Manticore, Medusa, Minotaur, Mule, Mummy
N - Neanderthal, Normal Human, NPC Party
O - Ochre Jelly, Ogre, Orc, Owl Bear
Living Statue is Mentzer, via Moldvay. As Moldvay hit shelves in '81, there can be little doubt Basic D&D (esp. Moldvay's Crystal & Rock entries here & going back to Lawful/Neutral/Chaotic) inspired the creation of the '83 Marvel comic, The Saga of Crystar, Crystal Warrior.
Giant Lizard is Mentzer, via Moldvay, w/ only a few changes to gliding speed for a Draco & "Save As" for a Tuatara.
Lizard Man is in H & M. Holmes' entry remains intact through editions, including info how victims will be taken to the LM lair to be the "main course" of a feast. The only difference is in damage verbage, & also, Mentzer, via Moldvay, adds that "Lizard men are often found in swamps, rivers, and along seacoasts as well as in dungeons".
Giant Locust is Mentzer.
Lycanthrope is in H & M. The main differences between the two, stat-wise, is that Mentzer's lycanthropes (via Moldvay), other than wererats, are each 30 feet/turn faster than Holmes'. The other main shift, other than differences in damage, is regarding alignment. Where Holmes has wereboars & werebears sometimes Chaotic Good, Mentzer's are Neutral only, though Mentzer does mention in the werebear section, "it might be friendly, however, if peacefully approached". Lastly, Holmes says, "All were-creatures are repelled by wolfsbane," i.e. a successful hit w/ wolfsbane repels. In Mentzer however, "If a lycanthrope is hit by wolfsbane, it must make a Saving Throw vs. Poison or run away in fear." I'll probably roll w/ Holmes' lycanthropes for now.
Manticore is Holmes.
Medusa is in H & M. Though Holmes' entry remains intact statistically, the descriptions diverge a bit. While Holmes says, "This monster is usually female," Mentzer, via Moldvay, says that a "medusa looks like a human female". Holmes also specifies that the snakes from the medusa's heads are "asps". The biggest divergence between H & M, however, has to do w/ medusa's gaze, as well as additional mechanics regarding battle w/ medusa + snakes in Mentzer. Holmes simply says that medusa's gaze "turns creatures to stone"; Mentzer on the other hand, allows the victim a Saving Throw vs. Turn to Stone, & also, if they make the saving throw, diverging from Moldvay, seems to be saying the medusa will automatically petrify itself: "the sight of the medusa will turn a creature to stone unless the victim makes a Saving Throw vs. Turn to Stone or she will petrify herself!" Lastly, Mentzer adds, "Medusae occasionally use weapons." For Holmentzer, going w/ Holmes.
Minotaur is in H & M. Holmes' entry, w/ a few damage stat changes, remains intact here, though his "bull-headed man" gamer joke has been nixed. Holmes' Minotaur gets 3 attacks (2 horns + 1 bite), whereas Mentzer's Minotaur, via Moldvay, can either gore & bite (2 attacks), or use a weapon (1 attack). In addition, when using a weapon, Mentzer's Minotaur gets +2 to damage. For Holmentzer, will use Mentzer.
Mule is in H & M, though Holmes' mule is in the Horse entry & quite brief: "Mules can often be taken into dungeons and they can carry 3,500 gold pieces. Horses can usually carry more, but lack the ability and calm necessary for dungeon expeditions." Interestingly, though Mentzer gives mules their own stats, which are straight from Moldvay (except for general No. Appearing), the big difference between Mentzer's Mule & Moldvay's is in regard to the same issue: how much a mule can carry. Moldvay says "2000 coins (or 4000 coins at most, with its move reduced to 60' turn)", whereas Mentzer ups this to "3000 coins (or 6000 coins...)" Mentzer also adds "if encountered in a dungeon, the mules may belong to an NPC party nearby." Mentzer for now...
Mummy is Holmes.
Neanderthal is Mentzer, via Moldvay.
Normal Human is in H & M. Holmes' "Normal Man" doesnt have an entry in the monster section, but is listed in his Combat & Saving Throw tables. Also, within details of his Sample Dungeon, Holmes stats "normal men" as having between 1-6 hit points. Mentzer is via Moldvay, w/ one sizable change: Moldvay's Normal Humans have 1/2 HD (1-4 hp), e.g. "an adult blacksmith would have 4 hp", whereas Mentzer's have 1 HD: "a blacksmith could have 8 hp". I'm thinking that Holmes' Normal Men may be a good median for Holmentzer, though gonna think on it. Thanks to Zenopus Archives for regulating regarding Holmes here.
NPC Party is Mentzer, via Moldvay.
Ochre Jelly is in H & M. Holmes' entry remains through editions, w/ specifics regarding smaller jellies tacked on by way of Moldvay. "It is, of course, ochre colored," says Holmes.
Ogre is in H & M, & while Holmes' Ogre pretty much survives, Mentzer's, via Moldvay, has AC 5, vs. Holmes' AC 6. When noticing the additions to the description, one could probably explain this diff due to Mentzer's having ogres "wear animal skins". Other than some slight diffs in Damage & Treasure Type, the only other bit is Mentzer specifying a hatred between Ogres & Neanderthals, like Goblins & Dwarves. Will use Mentzer.
Orc is in H & M. Mentzer's orc, which is via Moldvay, is faster than Holmes' which looks to trickle into Armor Class as well: Mentzer's Orc has AC 6, moves 120 feet/turn vs. Holmes' Orc AC 7, moves 90 feet/turn. Other than that, the main diff, as usual, is that Mentzer elabs w/ mechanical info regarding groups, tacking on a number of paragraphs. An interesting progression to note here is that while Holmes says, "Members of different orc tribes cooperate poorly and attack members of another tribe on sight unless under a strong commander," and Moldvay says, "members of different tribes are not usually friendly with each other, and may start fighting unless their leaders are present," Mentzer chooses to edit this bit out of his description. Though "different tribes" are mentioned, the antagonism between them is not. Since using Mentzer for Ogre, gonna simplify for Orc, & go Holmes.
Owl Bear is in H & M. Holmes shines through here w/ just one duo of beef w/ Mentzer, which is via Moldvay. Attacks & Damage. Holmes gives the owl bear 3 attacks: beak, claw & bear-hug, each doing 1-8 damage; Mentzer gives 2 claws & 1 bite, each for 1-8 damage, however, if both claws hit the same victim, the owl bear will automatically hug for an additional 2d8 damage. For Holmentzer, going w/ Mentzer for now.
A - D
E - K
P - S
T - Z