The weird thing is, there are also models that appear to be duplicates with different names ending in _1 or _0, but we, or at least I, don't know if that's what they really are. Moding that stuff can't be done yet so easily. That's unfortunate.
These denote the two extremes of the body type gradient. You can see the difference more clearly if you compare the two variants of the 3rd person body meshes. I can't imagine it being too much trouble to mod that, actually. The body type gradient should function automatically.
Personally I would like to see the beast races to have proper beast feet as well. In general, the races feel much too similar, both in appearance and racial traits/abilities. Regarding the gameplay It doesn't really matter which race you choose right now. It would add a level of complexity (and thus longevity) to the game if the choice of race would impact gameplay in a more meaningful way.