What breed are these ducklings?

[Serenity06]

We went to TSC today with no intention of coming home with 2 more ducks, but that's how it happened anyway. Can someone confirm the breed for me? I'm thinking Khaki Campbell, and White Pekin. We've only ever had Mallards and White Pekins, but it's been years since we had baby ducks. And how long before I'll be able to tell gender?
Their names are Chicken (the yellow one) and Goose (the darker one)

 

[Ducks4us]

Looks like a pekin, and the other looks like a golden 300
They look to already be around 2 weeks old
Mine females started making different noises around 3 weeks.
Now at almost 5 and 6 weeks the girls are very loud and obvious. And my one boy is very quiet
They are cute by the way