very likely that they are, but “main title” tracks in soundtracks often tend to be medleys of several songs from the musical. the disambiguation comment refers to the musical’s title, not the song.
side-note: whenever possible, i do think it’s preferable not to create extra works for tracks like overtures, entr’actes, finales, end titles if or when one is able to determine the actual work titles that are featured in those tracks. i don’t think i created those “main title” works; they were probably auto-created.