Mega Man Battle Network Legacy Collection: GBA to switch save file conversion possible?

[KentaZX]

I was wondering if it would be possible for a homebrew developer to be able to create some sort of a converter app that can convert the old mega man battle network games GBA save files to work into the switch version of those games? Or is it not possible at all since those games were not technically emulated and the games code was re-written? (someone said that earlier so I'm not sure how true is that)