These are zombie versions of the vanilla UMA archetypes. Since the archetypes already exist in the vanilla code, they are less likely to break between updates, and should be relatively easy to fix if they do.
If you want to create your own UMA zombies, there are (probably too many) details about how to do this, in the README of the mod.
This is almost certainly compatible with other mods that add other zombies or NPCs.
Note: If you want to install the old Bad Company zombie mod, that also contains its own zombie versions of the vanilla NPCs. (Khzmusik think his mod are slightly better, but of course he would.) If you have that already, you might not need his mod; but they should work fine together if that’s what you want.
The forum topic of the mod is here.