It all depends on how Boeing handles this.
If Boeing offers official compensation to any airline, all other MAX users have easy way paved to get their compensation as well.
If Boeing offers something under the table to big players and says it's not compensating anything to anyone, it might be harder.

I don't see Norwegian as a small airline (fleet of ~150). Take into account the fact that they seem to have some financial issues, they might not care about good relations with manufacturer and sue them quickly if not compensated.

Even smaller airlines like Enter Air in Poland (fleet of 22, including 2 MAX; and 4 MAX on order) told the shareholders that it will recoup MAX costs from Boeing.