Need help on breeds!

[Bird fanatic]

About 3 weeks ago I bought 5 ducklings from tsc. I bought 2 black ones thinking they might be cayugas, 2 yellow ones with dark brown tails and diamonds on their heads think maybe SA, and then one brown not sure of the breed. Now they are 3 weeks old and they are all getting their first feathers and they are all brown! Are they all the same breed, if so what breed? I know the "cayugas" aren't cayugas now but I'm very confused. They are swimming right now (I'm supervising) so pics In a bit!

 

[Bird fanatic]

I'll do better pics once they are done swimming

 

[quackpack3]

Look like they could be khaki or Rouen . Tractor supply has a section on their website to order breed specific or they display assortment. Google lens is a very helpful tool to compare your photo to others online which should help narrow down to the specific breed