If Norway finish second in the group, they'll face Ivory Coast in the Round of 32 and potentially Brazil in the Round of 16.
If they finish first, they'll likely face Sweden in the Round of 32 and Germany in the Round of 16.
If I were Norway's coach, I'd have rested key players too. Finishing second while keeping your best players fresh is better than risking injuries or fatigue just to secure a group position that could actually make your path tougher in the knockout rounds.