Had another look at the V4 to G2 product and it's changing the UVs not the mats, the new material part was me attempting to load V4 directly onto G2. Anyhow, projecting G3 material zones on to M4 removed the gaps and gave me some ears but that doesn't solve the problem on how to transform the UVs. Googling suggests Maya or 3DSMAX have someway to automagically do this. I'm just curious how someone took a UV map from one mesh and applied it to another non identical one, Ptex I can understand but how UVs if the faces are non contiguous which they appear to be? Sorry to go about this but always found UVs a bit of a dark art.