So I added a number of 'extra units' mods. I'm looking over the Custom Battles screen to check out the rosters, and note that a number of factions are showing TWO options in the drop-down list. However they don't show the same units roster for each.

For example, there are two Sparta; only one seems to have the extra modded units.

Also note that most factions did not duplicate, only some did.

The reason I ask, what will this do to the Grand Campaign; which of the duplicate factions will 'load' into the game? Yes, I know I could spend hours trying to find out, but just curious if anyone knows offhand (saving me the time!) what will happen if I play the Grand Campaign with all these new units mods, apparently causing a doubling of certain factions, at least on the Customs Battle loadout menu?