Europe dwarfs Zambia: about 10,180,000 km² km² against 755,593 km² km². At true size Europe is about 13.5× larger — the whole of Zambia fits into Europe roughly 13 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 13× into Europe.