it's possible to use uvmapper classic to import v4 uvs to m4 and vice versa.  you need to save it as a seperate obj.  i set up a V4muvs cr2. and M4vuvs.

there was a tutorial on how to do it, on which checkboxes to use in uvmapper. 
-don't have the bookmark handy.

 

i tried it with K4.  it stretches m4 and v4 textures, doesn't look so great.

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