Any big differences between the factions?

I can't seem to find a big tech/troop tree for the races, and i really don't feel like trying out all 10=p

I've played as a kingdom and an empire and saw the different tech lines...

But i'm a bit curious if theres any difference troop wise within the 5 empires. / 5 kingdoms (i understand that kingdoms and empires get different troops). Or is the only difference just their racial traits?