My first guess would be a"bydue" (Columba livia var. domestica), since these can come in lots of different color variations, but it seem to lack the black spot/stripe on the back, so it is probably another species. But it does not really fit the other species in Norway neither.. I hope someone else manages to identify it, because now I am curious to find out what it is.
If you don't get an answer here, then it might be worth making a post on Spør en biolog, and they can probably tell you.
You are probably correct, and it does look a lot like the others except the aberrant color pattern. But thanks for the link, and I will probably post the pictures and see if I get some answers.