It would be nice if there was an option to delete the uploaded version of the duplicate and keep the 'official' google play cloud version. It seems that Dupe Killer deletes the google cloud copy but I would rather keep their clean official version than my old mp3 upload version. When you have a duplicate you can see which is which by clicking on the three dots. If there is a "Delete" option then it is your uploaded copy, if there is only "Remove from library" then it is google's copy.