More preparation could make a Norwegian campaign costlier

What does a delayed war do to a Norwegian campaign?

Norway gains time to prepare and a naval campaign could become far bloodier as more carriers and modern forces enter the fight.

Norwegian preparations could advance beyond their historical 1940 state. At sea, a 1942 confrontation has more carriers, better aircraft, and larger fleets available to both sides. That increases the potential cost of operations around Norway rather than making the campaign simple for either side.