no, that is most definately a norwegian. the face is nice and blocky. she's just a gangly little baby one. from the pictures i'm pegging her at about 5-7 weeks old in fact, though i could be wrong, its always easier to tell when you're actually holding them or at least seeing them in person. when they're young they're a bit out of proportion, just like any other baby thing. so from that i say you have 2 very beautiful GIRLS.
as far as the 2 types interbreeding, i'm really not sure. i know mice and rats can't but i don't know about other similar breeds of rats. i know i have a site bookmarked that would help with this but i'm on my boyfriend's computer right now so i can't access that link. when i get back to mine i'll look it up.