Since Mughalistan actually had less belligerance than I did before I annexed Russia, I don't really see the problem with that.I was thinking of giving them vanilla ones but I don't think that works for a country like the US. For now I will say vanilla setup though and see what happens when people release nations and if it works doing it that way.
As for the belligerence thing I assumed that the actions taken by each nation in the war were the same so a simple swap would work between Byzantium and Mughalistan, which is what I did.