Help with breed identification/sexing 3 month old ducks!

[MVie]

Hello! First time Duck owner here!
We had a broody hen ( no rooster) so we decided to have a little fun and let her sit on some random duck eggs I picked up from someone on Facebook. She successfully hatched two but they look nothing alike! Any help with breed identification or guesses on sex would be wonderfully helpful for our curious minds!
Thank you!

 

[cheezenkwackers]

Looks like a male Rouen on the left and a male black Swedish (based on on the billl color) on the right (bottom picture). They could also be mixed breeds.

 

[Miss Lydia]

They sure are pretty