They're mixed breeds. They don't really have any defining breed characteristics. I can tell you the colors, though. The 'yellow' one is Harlequin, and the brown and white one is Broken Agouti
It is hard to know the breed of rabbits at young ages because they are not done growing, but they are super cute!
Just a question: Do you plan on getting them neutered and then bonding them? If you do not neuter them they will start fighting (possibly to the death) when hormones kick in. Here is a link and video on bonding: Bonding Bunnies