Good observations.
https://www.fab.com/listings/a15437e4-349d-49e6-ad3f-c9b9f137f8f9 - this character from fab definitely seems to be wearing the Julius Caesar outfit by Xurge.
Julius Caesar_Male - Character Creator/outfit | Marketplace
It is possible they are the same person going by different names in the two stores or its possible Xurge gave them the rights, however if a number of clothing/characters are showing up in FAB by various artists, it could be suspect.