Apple One & Itunes Match

The changeover should be seamless. Apple One includes Apple Music. Apple Music is a superset of iTunes Match, and includes the matching and uploading features. That said you really should have a backup of all of the music that you've currently added to iTunes Match, and should not rely entirely on the cloud. If the cloud has the only copy of a track, and you delete in error, then it has gone for good. You cannot rely on copies downloaded to a device either, iTunes/Music will keep a downloaded item and mark it as removed, but the deletion is performed immediately on iOS devices.

tt2

Hi,

As both use the iCloud music library, you will not see any difference. The transition will be seamless. In any event, I suggest that you keep a backup of your own music.

Jim