I always wondered why devs aren’t using this model for the Savars, then I realised Knight line always use swords instead of spears.
So this is my idea, Cataphracts model could be use for a new UU for Byzantines Knight line called Latinikon which is basically Norman Knights with Byzantine armor. While the Savar model could be use for the Cataphracts or Clibanarii if you want it to sound more Byzantine.
Latinikon from Medieval Total War: Stainless Steel Mod