Brown ones have the face of EE's, and if they have green legs, they are EE's (easter eggers) but often sold as auracuana or americuanas. The yellow(?) ones in the first pic have yellow legs so my guess is that they are buff rocks (if their feathers are golden yellowish, hard to tell from pic). The two white ones in the second pic could be white rocks, but often it is hard to tell as chicks.
The dark ones have dark legs (looks more black)..The 2 yellow ones in the first pic were dirty when I bought them...Now they look like they have white wings...The 2 bottom ones are getting white on their wings.