Nearly a tie: Iran and Libya differ by barely -0%% in area — about 1,622,847 km² km² against 1,626,369 km² km².
Iran 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 1×.
The old Mercator map treated both about equally (1.4× vs 1.3× inflation), so at least their relative sizes were preserved — even if both were drawn at the wrong absolute scale.
Libya fits 0× into Iran.