Welcome to BYC. Glad you decided to join our flock. The difference in coloring has nothing to do with their gender. EEs are hybrids to begin with and as a result, the chicks produced by them can look a lot different. The bottom chick with the greater amount of yellow is more closely favoring the Delaware. The black one with the white spot on its head is either a Barred Rock, Dominique, or Cuckoo Maran (I'm not sure which as I can't see it's legs, and it could be either sex no matter which it is) or else a Black Sex Link cockerel. Black Sex Link male chicks and Barred Rock chicks (both sexes) look virtually identical. Please feel free to ask any questions you may have. We are here to help in any way we can. Good luck with your flock.