What breed did you order? How old are they now? Have you weighed them and some of the others? A photo showing relative size between them and the others could help. Without anything to go on my first guess is that you got a couple of boys.
From how those are feathered out I'd guess they are about 4 weeks old. Cornish X at that age would look a lot different, they would be a lot broader. Their legs would be more spread out and chunkier.
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.