It should work, as I think that with texturing for SL you need to sepperate the model into the corrisponding maps to upload the model as prims and then the textures to fit the model.

I think that if you look for the SL textures there broken into sepperate maps for the head, torso, arms etc etc so yes it should be what your after, as when the obj's been imported its just applied each of the maps onto one UV map.

I would have a bit of a research into it so your not going down the wrong path.