Are mine true chocolates? Can you tell by pictures? One of them has red blotches on her wings and the other one has one red feather on the back of it's neck. The one that I'm sure is a cockrel is a nice dark chocolate color...
I'm also trying to decide if the two outside birds are pullets or cockrels. I'm sure the middle one is a cockrel...
Your birds do look like sex linked Chocolates, not Dun.
Watch out for any red/orange feathers. This is a color fault called leakage, meaning they are leaking color from recessively carrried genetics...
You DO NOT want to breed any birds with leakage. They should be culled.
Wait until they are mature though, as it could also be damage from the sun that is bleaching their feathers, though at their age it is unlikely.