Asia dwarfs Oceania: about 44,580,000 km² km² against 8,600,000 km² km². At true size Asia is about 5.2× larger — the whole of Oceania fits into Asia roughly 5 times.
The old Mercator map treated both about equally (1× vs 1× inflation), so at least their relative sizes were preserved — even if both were drawn at the wrong absolute scale.
Oceania fits 5× into Asia.