How to convert a batch of MP3's in Apple Music to AAC, then automatically delete the old MP3s?

I would like to convert a large number of MP3's in my Apple Music library to AAC (to save disk space). Using the Music app, I have tried it with all songs of an album. Now, I've got each track twice, once in MP3, and again in AAC. That's very cumbersome to go through all songs and find the old mp3's. Is there an easier way? (I have googled, but did not find anything really useful.) I converted the tracks as follows: I went to the album, selected all tracks in it, went to File / Convert / Create AAC Version, and let Apple Music do the conversion. That worked, but, as I said, afterwards, each track was duplicate in the album.