China dwarfs Democratic Republic of the Congo: about 9,371,225 km² km² against 2,334,703 km² km². At true size China is about 4× larger — the whole of Democratic Republic of the Congo fits into China roughly 4 times.
China sits in Asia, Democratic Republic of the Congo 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 4×.
The old map muddied it further: Mercator inflates China about 1.6× and Democratic Republic of the Congo about 1×, so on a Mercator-style map this pair appears 6.3× apart instead of the true 4×.
Democratic Republic of the Congo fits 4× into China.