At true size, Greenland is about 0.1× the size of North America. On the old 1569 Mercator map the same two appear about 1× apart — the old map exaggerates their difference by a factor of 11.8×.
It is a latitude illusion: Greenland sits near 73°, where Mercator multiplies area by about 11.8×, while North America lies near 10°, inflated only about 1×. Equal Earth removes that latitude tax, and the pair settles at its honest 0.1×.