Nearly a tie: Argentina and Greenland differ by barely -23%% in area — about 2,782,703 km² km² against 2,154,754 km² km².
Argentina sits in South America, 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 0.8×.
The old map muddied it further: Mercator inflates Argentina about 1.5× and Greenland about 11.8×, so on a Mercator-style map this pair appears 6.2× apart instead of the true 0.8×.
Argentina fits 0× into Greenland.