After checking, I know what you mean. Indeed, the "ghulams lancers_ug1" are those of BC, only the horses are changed. This is also the case for the Turkish ghulam cavalry and the Moorish black guard.For "Arab infantry", I used the BC base, but their armor level is visible and changes with the ug1 and ug2 versions. What's more, the texture colors are different for Moors, Abbasids, Fatimids and Zengids (which I also did for Ghulams and most of the units I reworked).
I've also worked on matching the right flag bearers to each faction.
Of course, there are still a lot of units that need to be reworked! I'm just taking it one step at a time! For example, I'd like to redo the first level of Muslim bodyguards (some have anachronistic costume elements for the 12th century). For clarity in battles, I'd also like their horses to be colored to match their faction, like Western bodyguards...
You see, I've already done a lot of work adapting BC models, but it's far from exhaustive. The changes to the horses, the banner bearers and the officers accompanying the units are also a clear visual improvement on BC, I think.