It seems very doubtful seeing as you can select the SMB2 overworld theme on both the SSB64 Mario stage and the Mario Maker stage.
Fourside is very likely at this point (what with a few Mother songs missing from Onett: song one and song two), despite the limited recovery points for both Lucas & Ness (vertically narrow skyscrapers, but then, Melee didn't cater for the latter).