Texture Transformer (which comes with Blacksmith 3D Pro or can be bought as a stand-alone) works the same as Texture Converter, it recreates the texture for the other map. The Genesis 3 UV's are different (see the quoted passage above.) The UV swapping in Daz between Genesis 3 and any other figure involves geografts. I do not understand the reason why you can't just remap the texture, there's presumably only one surface, it's beyond my comprehension. Blacksmith has a feature (the texture transfer brush) that allows you to copy textures between the same figure with different UV's (it also works with figures who have the same mesh if you morph one into the shape of the other) and in theory this should allow you to transfer a texture from Genesis 3 to M4 if you load one figure (Genesis 2 or 3 or whatever) with Genesis 3 UV's and the texture you want, and the same figure with M4 UV's, but again there is the weird geograft situation, and the texture transfer brush is apparently very picky and I don't know how to appease it. I've never been able to get it to work with Genesis figures at all.