Here you go....
1: list all your audio
2: remove all duplicates of artist,album and year, to leave you with one example of every combination of artist-album-year in your library.
3: keep duplicates of artist and album as these must be "same album, different year"
4: expand to full albums in order to see all tracks in each affected album.
If you use this in a smartlist, then open the editor, click on the "Import / Export" button and paste the blue text below into the box provided. "Ok" your way back out to view the results.
Alternatively, go to an audio view that lists all your music and paste the blue text into the search field in the top right of the window.
[media type]="audio" ~nodup=[album],[year],[album artist (auto)] ~sort=[album] ~dup=[album],[album artist (auto)] ~a
regards,
-marko.