Or instead of converting every single texture each time you can use UVMapper and open up M4's obj. Save this as a .uvs file and then open V4's .obj and apply M4's uvs. Resave that V4 .obj under a different name such as V4M4UV and edit any V4 .cr2 to point to that .obj (there are two instances where the .obj is called in the .cr2). You now have a V4 figure that accepts M4 maps. Since Generation 4 is the same mesh you can do this to M4 and get V4's UVs and even mix up the Kids4 as well. If you want to take it a step further get this handy set http://www.sharecg.com/v/45885/related/11/Poser/Mix-K4M4V4-morphs and now you have .cr2s of each figure that accept morphs of the other. You can further edit copies of those .cr2s to accept the relative maps as well!