Yes they can and will lay in the same nest box. I’ve had an insistent chicken climb on top of the first chicken in the box to lay her egg.
Both pullets are laying.
EEs can be a mix of so many different blue egg laying breeds they can all look very different. Many hatcheries sell them as Americana which is confusing. This is my Splash Ameraucana.
I was there for the opening day of the Baltimore Aquarium (went to college in Towson). I’d never seen anything like it in my life, really blew me away! I’ll need to go back at some point.