I mean, sort of? Megabats and microbats are just two sub-groupings of bats used in biological classification. Megabats can be found in most of southern Asia (from Pakistan eastward, and as far north as roughly the Himalayas), most of sub-Saharan Africa, and northern and eastern Australia. It’s less that Australian bats are unusually large, and more that Europe and the Americas only have small bats.