First Photo: chick appears to have a pea comb.
2nd Photo: chick appears to have white feathers and muff/beard (fat face). I cannot tell about its comb.
Ameraucana should have pea comb and muff/beard (fat face.)
Buff Orpington should not have the pea comb or the fat face, and should have buff (light brown) feathers--although sometimes they can be so light they look almost white at that age.
Farm stores usually (but not always) have Easter Eggers rather than true Ameraucanas. The differences matter if you intend to take them to a show, but do not matter if you just want a pretty bird that lays colored eggs.
I think you've probably got two Easter Egger chicks, one with a beard and one without.