Black copper marans - distinct differences but who is who?

[PrincessFig]

One of the two or both are crowing. We can't seem to catch the culprit, so tell me who do you think it is?
They're roughly 7 weeks old.

Edith/Eddy:




Evie/Ned:

 

[donrae]

Both are cockerals.

 

[PrincessFig]

I thought as much, I was hoping to keep one but I guess they will both have to go....

Thanks so much!

Sharon