So... the Ams all appear to have lighter colored wings, while the BA are darker black, and some of them seem to hsve white wing tips already, a BA characteristic in juveniles.Puffy cheeks are the easiest way to tell.
That's how I could tell my ameraucana chicks from the other lookalikes
Doesn't help when none are facing the camera
The two on the bottom right (with the leaf) the one on the right appears to have cheek puffs (ameraucana), and the one on the left appears to be plain faced (australorp)