Breed help!

[Kraemer7]

I was told (it’s my first time buying hatching eggs off eBay) that these were cayuga ducks. They don’t look like the photos I see online- with the yellow chest. What do you think?
They’re cute nonetheless, but my kids were excited about cayugas.

 

[Corbdee]

Looks like a mix to me. Did the flock they came from have any other ducks?

 

[Corbdee]

Very left looks cayuga.