Nearly a tie: Algeria and Greenland differ by barely -7%% in area — about 2,322,788 km² km² against 2,154,754 km² km².
Algeria sits in Africa, Greenland in North America. On the old Mercator map the latitude gap distorted how large each felt beside the other; at true size the answer is simply 0.9×.
The old map muddied it further: Mercator inflates Algeria about 1.3× and Greenland about 11.8×, so on a Mercator-style map this pair appears 8.6× apart instead of the true 0.9×.
Algeria fits 0× into Greenland.