Although I haven't had the time to try this, I imagine that anybody can cut and paste one map into another. Unfortunately, the M2/V2 and M3/V3 maps have been mapped very differently. M2/V2 cut the body like a toy model where the figure is sliced into a front half and a back half where there is a seam all the way around the body as the two halves are joined. M3/V3 essentially have their skins unravelled, split down the middle of the back. It's much easier copying a texture from V1/M1 to V2/M2 because both models had essentially the same maps with some rearrangements of where the hands and feet were located on the map. A simple Photoshop action could probably convert V1/M1 to V2/M2. Probably the same can be done between M2/V2 and M3/V3, but there's a little more work involved.