Yay! I hope those two do okay! Is this duckling really sticky? As long as it seems healthy and happy I think it will clean its feathers.
I don't know if they will ever change their marking techniques. If you want to guarantee what breeds you get order from Metzer Farms or Holderreads.
I think it is a chocolate runner or a khaki campbell.
It's definitely not a mallard. True mallards look like this.