Given the geography of the region there's not much difference - you're either on the north side of a strip of land dividing two large bays (Sydney) or you're on the south side (Botany Bay). Ironically, nowadays, everyone who flies into Sydney airport technically makes landfall in Botany Bay as the runway sticks out into said watery void.
Incidentally, as a songwriter, you can do a lot more with a a four-syllable name than you can with a two syllable name.