What breed of duck are these?

[angela27]

My sister got these ducks for my niece a few years back. I'm trying to work out what breed they are. I'm thinking maybe a khaki campbell? Or a cross? Interested to know what other people think

 

[Bills vs Beaks]

How heavy are they?
The bottom one could pass for a campbell, but the top one is very dark. Are they both girls?