Any guesses on my ducklings’ breed?

[lisakathleen]

Our ducklings are now 4 weeks old and I’m still stumped as to what breed they are. They came from tractor supply and were the only two mostly yellow ducklings in the tub with a bunch of Muscovy ducklings. We didn’t want Muscovy so took these little dudes instead. I know if I were patient it will become clear within a few weeks but Im not Any thoughts? The pics show the progression of their feathering. Growing up so fast

 

[citymeetscountry]

One may be a silver Apple yard

Eta: the one with black tip tail and head spot

 

[lisakathleen]

One may be a silver Apple yard

Eta: the one with black tip tail and head spot

Thank you, that’s one breed I was leaning towards! Is it possible they both are and one is male and the other female?

 

[citymeetscountry]

My other thought is possibly welsh harlequin. (I am not a duck expert though by any stretch). I have Rouen, Pekin, and Rouen/Pekin mixes

TSC (in my experience) uses Hoover’s Hatchery so I usually consult this https://www.hoovershatchery.com/id-my-chick.html