they do, but its really hard to tell. I find my hens get tailfeathers in faster than roos. lil roosters usually get longer legs faster.
The chipmunk striping is common in many breeds so its hard to tell for sure. I do see some blue in there, they will be attractive birds IMO!
Bottom line is EE is a mix of a blue layer to any other breed. OE olive egger is usually a Maran or Welsummer crossed with blue egg layers.