Does it all come down to ear lobes?

[imzadi]

Got some "rainbow layer" mix chickies...thinking I know what all but two are...

Grey, dark legs, single comb...thinking blue andalusian or blue australorp.

White, yellow legs, single comb...thinking white rock or...white leghorn.

For both sets...it SEEMS to me that the only difference (until they lay and I can see what color the eggs are) is the earlobe color. Whether red or white...

Am I on the right track? Is there another feature that I'm missing to tell these sets apart?

 

[RoostersCrow HensDeliver!]

Body size too, when they're more mature the Mediterranean breeds will be a lot smaller in size than the American / English breeds. The Andalusian and Leghorn breeds are in the Light breed class while the Rock and Australorp breeds are in the Heavy class.