Khaki Campbells please help

[eggs and chicks]

hi i have got 3x 1 and 1/2 month old KC's but i think 3 more of mine may be KC's too they look the same except darker almost black they were completely black with a little yellow on their chest i cant post pictures sorry i know that would help but my question is can KC's be darker sometimes or is it a gender thing oh but i just discovered that 1 has some green on his head and his tail the darker ones

 

[Amiga]

In general, I think there can be some variation in colors within breeds, not talking about the show quality, but including the pet quality ducks. My chocolate runners' brown colors have some variation, from a dark chestnut to a brighter mahogany brown.

 

[eggs and chicks]

thank you