Blue Copper Marans?

[ChickChic00]

These 3 are supposed to be bcm and I just wanted to know if anyone else thinks that they are the blue Copper Marans also. They were supposed to be all females but the darker one is a bit smaller and looks like a rooster. Any help is appreciated!! Thanks in advance!!

 

[sourland]

To me they look like blues, and the last chick pictured may very well be a cockerel.