Uhm did my duck step out on her drake? What is this duckling?

[HopefulAcres]

I apologize for the binocular photos.
My Clover hatch two babies today! The other 8 eggs died at least a week ago so we were excited when she brought these two nuggets to us this morning. Clover and Edgar (dad) are Rouen Khaki crosses and one of the ducklings looks like them when they were tiny. However the other one is a ?? Black head, back and wings. Bright yellow chest and belly with yellow on the tips of the wings. Black legs and feet with yellow webbing and pale pinkish bill. I stressed they all by moving them to the fenced duck yard so I can't get nearer today for better up close pics.
First two pics show the duckling in question. Last pic is of mom and dad

 

[sourland]

Nope she's been faithful. Mallard derived crosses can come in many variations.

 

[HopefulAcres]

Nope she's been faithful. Mallard derived crosses can come in many variations.

Thank I wondered if it had to do with parents being crosses but it's so shockingly different than all the crosses I've seen. It's a fiesty adventurer ❤

 

[Miss Lydia]

Beautiful mom ,dad and ducklings

 

[Bayou Magpies]

Thank I wondered if it had to do with parents being crosses but it's so shockingly different than all the crosses I've seen. It's a fiesty adventurer ❤

Looks like a Magpie