Pure Muscovy or mules?

[Breemae123]

Alright so I bought this 2nd batch a week after the first. They were very small and a week old. So not only did I find out that they were fed just cracked corn but the advertised pure Muscovies were in with other ducks. So these are potentially mules which I don’t want.

So what are some signs to tell the difference? They are pretty young still, born at the beginning of July.

These were taken when I first got them and then 2 weeks ago, I can get new pics tomorrow.
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Mine are pure Muscovy and they look very much alike.

 

[AlleysChicks]

Aw they are cute! I like that little dark one in the 2nd pic