Topology is totally different, and the shading domains are completely different as well.  That said, I'm sure someone will devise a texture converter in time.  But I also get tired of seeing the same old textures, tweaked a bit, on various characters, so I'm looking forward to new and fresh maps for G9.  I'm more looking forward to more Zev0 morph kits, like those that exist for every other Generation.  But for sure, I'm thankful that G9 works in Carrara without too much of a fuss.  Figure merges still don't work well in the latest beta of DS so I'm really glad that G9 works in DS4.10