Closer than most people guess: Algeria (2,322,788 km² km²) is only about 17%% larger than Kazakhstan (2,712,747 km² km²).
Algeria sits in Africa, Kazakhstan in Asia. On the old Mercator map the latitude gap distorted how large each felt beside the other; at true size the answer is simply 1.2×.
The old map muddied it further: Mercator inflates Algeria about 1.3× and Kazakhstan about 2.3×, so on a Mercator-style map this pair appears 2.1× apart instead of the true 1.2×.
Algeria fits 1× into Kazakhstan.