Tai Kingdoms (Purple, Orange, Blue and Green) ruled the most part of Southeast Asia at 1400 CEST.
In my opinion you can make them different. Both Jurchens and Khitans were famous thanks to their metallurgy and armor. I haven’t finished my Khitan civilization, but I think the Jurchen one is different from aoe2’s nomad civs.
- They can train water buffalos from Mills (maximum 20, 30W cost) Tartars can feel a bit similar, but they are a broken civ and we can expect them to lose one sheep. Also this is not free, but very effective in the early game compared to Farms
- Extra melee armor on Steppe Lancers - Why not? They are an “armored civ”
- Armor technologies are merged - This saves resources and gives a better transition
- Extra pierce armor on gunpowder units -The first nomadic gunpowder civ
- Iron Pagoda Unique Unit
- Good Heavy Cavalry (Nomadic civ without Hussars), Cavalry Archers and Gunpowder)