I don't think I like your world. It needs a good abolitionist movement terribly badly. So Sephiroth was born intact and surgically castrated. A clone of his allowed to go through puberty would have the heavier musclature produced by testosterone, and shorter bones. The various enhancements would show up differently. I thought Hojo had made his projects natural castrati and they just didn't go through puberty. In that case a clone of Sephiroth would be basically identical, and not really worth the bother.
Plastic surgery could be used to create attractive purpose bred to sell as sex toys.