very pretty EE pullet
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All Easter Eggers. Much too early to even guess.
Ameraucanas are always one of the recognized color varieties for the breed. If no variety was specified when you got your eggs, they are Easter Eggers. Each variety looks a specific way as chicks, and feather out a specific way. Your yellow chicks looks kind of like a Wheaten or White, but is feathering in black and white (silver), that would indicate it's not one of the recognized varieties. The dark brown chick doesn't match any of the standard colors.
Your chicks probably came from Easter Eggers. Most people have Easter Eggers instead of true Ameraucana. Hatcheries sell Easter Eggers as 'pure' Ameraucana, to charge another dollar per chick, and they think that using a pure breed name will make the chicks sell better. Most people buying those chicks have no idea that the hatchery is being dishonest. They buy those "Ameraucana" and start breeding them, thinking they have the real thing.