I know UNP has higher poly count,...CBBE needs more polys in breasts, butt, pelvis, thigh, heels, upperarms and neck,....probably in most dire need of higher poly thigh/pelvis than the others.
But then you'd have to repaint weights,...and I'm assuming refit textures? I don't know much about texturing,...but I could probably handle all the modeling.
Yup. If you modify the topology, then not only will you go through the joys of repainting weight maps, the UV maps will also change. Meaning you'll get to redo the textures ( Chuckle. . . . see how this snowballs ? )
If you simply subdivide the mesh without changing the topology lines, you may be able to continue using the existing UV maps ( emphasis on may ) but you would definitely want to rework the weight maps to take advantage of the higher poly counts.