Skins (textures) not if they use the Gensis 8.1 UVs, morphs yes since the emsh is the same. But why would you want to? You are doing a lot of manual work to mimic what is automatic with 8.1 (the differences are the surface groups and the extra UV set, plus the different expression set-up but you can quite easily make the Genesis 8 expression available to 8.1).