Nearly a tie: Indonesia and Libya differ by barely -13%% in area — about 1,872,242 km² km² against 1,626,369 km² km².
Indonesia sits in Asia, Libya in Africa. 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 Indonesia about 1× and Libya about 1.3×, so on a Mercator-style map this pair appears 1.1× apart instead of the true 0.9×.
Indonesia fits 0× into Libya.