Like i undertstand they all originate from the same Calradian Empire and it would require new trees ponetially (not sure how this works) but i feel keep the troops the same names as in impreial footman in all 3 but have there troops look diffrnet rather maybe diffrent lookiing helemts or more decor on the armour compared to the others than just beeing like these guys are the purple empire these ones are the dark blue since i feel it would allow better looking armies and more immersion.
if a city or village switches to a diffrent empire faction due to it not being a diffrent culture the troops look could change with it to the new owners
if a city or village switches to a diffrent empire faction due to it not being a diffrent culture the troops look could change with it to the new owners