Norway vs Japan: which is bigger?
Norway is bigger: 385,207 km² against 377,974 km², about 1.02 times the size of Japan.
Drop Norway onto Japan →Side by side at true size
Both drawn at the same scale on an equal-area projection.
And on the usual world map
On the usual world map Norway looks 5.7 times bigger, not 1.02: the map inflates Norway about 9 times and Japan 1.6 times.
In numbers
Areas: official totals including inland water (UN Statistics Division via Wikidata). Outlines: Natural Earth. How Globegami works