Chick # 2 is the Marans. Chick #1 is a cockerel. It's too soon to tell which is the Barred Rock and which is the California Grey. In a few weeks, the difference in body type may be more obvious.
Barred Rock= yellow skin, red earlobes.
Cuckoo Marans= White skin, red earlobes
California Grey=smaller, lighter built, yellow skin, white earlobes.
The rules for sexing regarding the barring color hold true for every breed that is pure for the barring gene.