Africa dwarfs Zambia: about 30,370,000 km² km² against 755,593 km² km². At true size Africa is about 40.2× larger — the whole of Zambia fits into Africa roughly 40 times.
The old Mercator map treated both about equally (1× vs 1.1× inflation), so at least their relative sizes were preserved — even if both were drawn at the wrong absolute scale.
Zambia fits 40× into Africa.