And in 5e, the idea of NPC classes as such went away entirely. Classes are for PCs and only optionally for use in constructing NPCs. 5e commoners are just commoners, no class levels at all. Even the closest MM NPCs (like the various Evoker, Archmage, etc ones) don't have all the class features and proficiencies, nor are they built exactly the same.

And there's a book coming out that will shift even most of those away even more from the class level paradigm by converting many spells/spell slots to x/day, recharge, and at will abilities (ie can cast x , y, and z 3x/day each).