x3 those are EEs.
Note the pea comb, the muffs (poofy cheeks on at least one chick), and green legs on one of them. Also, body shape and size at 4 weeks.
As Ridgerunner said, CX have single comb, and are much rounder/chunkier, and probably twice that size at 4 weeks.
I'm not the best at EE sex ID, but I think those are female. Post pics again when they're 6-8 weeks old if you're wondering and we can take a look, cockerels should be obvious by then.