Olive Egger vs Copper Maran

[Wasquechicks]

I just started incubating 8 eggs. They're all dark brown. The woman I got them from had 2 roosters. She said the chicks would either be pure Copper Maran or Olive Eggers. Any way I can tell which is which once they hatch?

 

[PouleNoire]

It might be hard to tell just after they hatch you might have to wait a few weeks until they feather out a little.

 

[Percheron chick]

The OEs should have pea combs and the marans single combs.