The mainland China release was added first with titles in simplified Chinese and no durations. Now I've added the original Taiwan release and associated recordings, but there's no way to sync the recordings with that tracklist. The first thing I tried was to make no edits but in the recordings tab check "Copy all track changes to associated recordings." That does nothing. I then tried making a bunch of bogus edits but couldn't figure out any change that would separate the bits that I wanted to change from the bogus changes, see e.g. http://musicbrainz.org/edit/17836908
It seems that the only way to get the correct titles and durations of the recordings is to edit them one-by-one by hand.