Chocolate Orpington gender?

[KGQuail24]

I ordered 2 chocolate Orpingtons (among a total of 9 hens), but at one week of age, I'm thinking one of them might be an accidental roo. All the chicks seem to have better developed, longer wing feathers and some tail feathers coming in except one, and they all supposedly hatched on the same day. I'm including photos of the chicks together and separate. Between the two Orpingtons, what do you think I've got here?

 

[nuthatched]

Too early to say yet, wait 3 or 4 weeks.