This video (entirely in Norwegian, but aimed at language learners) explains the difference quite well: https://www.youtube.com/watch?v=7LbtBdOoR2g

Takk!

This is a very interesting question! Some people are more polite than others, and in different situations a “unnskyld” or a “beklager” is more appropriate than the other. Additionally, people also like to say "sorry" But let's have a look at a specific situation, for example when you want to get past someone on the street or bus. I would say "unnskyld" before I try to get past someone and if I step on his/her foot (accidently) I would say "Beklager" or "Unnskyld" However, I would not say "Beklager" before I try to get past someone. Perhaps it's a bit similar to "Excuse me" vs "Sorry" in English? > Excuse me; this is my stop. > Sorry! I didn’t mean to step on your foot!