The one in pic with Dr. Pepper box looks like has a more red comb...that makes me suspicious.
I got 3 "female" Americauna chicks and one had a red comb almost right away and yep...she turned out to be a he. Also, he was more bold as a chick...always wanting to be held and always trying to be in front of brooder opening trying to get out LOL! Any behavior differences?