The pads will trasfer material to the discs, so, whilst replacing the track pads, which are typically noisy, there will still be that material on the dics when you swap out to street pads.
When I use to play "race car driver" I would sand the discs with some wet and dry then clean everything with brake clean prior to swapping between different pads.
My old QFM 1ARM (good local pad for sprints) would squeal like crazy, if I just swapped out to QFM HPX they would still squeal, but if I sanded everything they didn't.
I also like to sand and clean pads.
As for bedding in, I bed in both street and track pads the same.