To reply to you initial query: No. PCs and Monsters are not the same thing. That is why they are PCs and [everything else is] Monsters. So there is literally no reason that what adjustments and systems used for Monsters would be applied to a PC.
At the root orf practically every game or contest is the concept of "Us vs. Them." In D&D, that is the "PCs [us] vs. Monsters [anything that is a them]."
Yes. A Monster can be a PC race (human, elf, dwarf, etc...). Yes. A Monster can have PC class features/spell use/abilities. But that does not make them a PC any more than making a PC who is, say, a centaur or hobgoblin or pixie makes them a Monster.
Again, PCs and Monsters are not the same thing. So, in the game, there is no reason for them to be treated exactly the same. There are similarities, certainly. They have to interact and [potentially] fight each other in the same game system. But they have no reason, nor precedence in D&D history, to be the same.
Which brings me to my next point...
To you other comments and queries: "B/X" is a term that refers to "Basic/eXpert." Namely, the "Basic" and "Expert" sets of the original D&D game.
Tom Moldvay was the editor of the next revised edition of these manuals (the first being John Holmes, who you might see referenced as "Holmes D&D" or "Holmes B/X" which preceded Moldvay B/X be a few years). Hence, you will see reference to that particular revision/edition as "Moldvay B/X" [and/or possibly the "Magenta and Light Blue boxes", respectfully].
Following this is the Basic and Expert editions (also sometimes referred to as the "Red & Blue boxes", respectfully) were edited/revised by Frank Mentzer, hence "Mentzer D&D" or "Mentzer Basic" or (somewhat inaccurately) "Mentzer B/X." This edition from the early 1980's further expanded in the following few years for "Companion", "Master", and "Immortal" PC level play, completing what is commonly referred to as "BECM" or "BECMI" D&D.
So "Moldvay B/X" is widely considered one of the earliest versions, leading to the mass popularity of the early/mid-80s, of the game called Dungeons & Dragons...which you are apparently playing.
All of these versions [not to mention "White Box" or "Old D&D", AD&D 1e, 2e, D&D 3e, etc...] are "official" D&D.
So, before you want to get rude and dismissive with people contributing to your thread, maybe you should know a little something about the history of the game you are playing. Wikipedia has all kinds of info on all of the above [and more] editions of D&D. Should be easy enough to find.
