China dwarfs Sudan: about 9,371,225 km² km² against 1,863,027 km² km². At true size China is about 5× larger — the whole of Sudan fits into China roughly 5 times.
China sits in Asia, Sudan 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 5×.
The old map muddied it further: Mercator inflates China about 1.6× and Sudan about 1.1×, so on a Mercator-style map this pair appears 7.3× apart instead of the true 5×.
Sudan fits 5× into China.