WORK SONG vs. DILIGENCE

Looking at the text authority page for "Work, for the Night is Coming", I see a pie chart showing that most of the instances involve a tune called DILIGENCE. However, when I click on All tunes published with 'Work, for the Night is Coming', there is no tune listed called DILIGENCE. However, the listed tune, WORK SONG, appears on comparison of page scans to be the same as the one called DILIGENCE. It would be helpful if one or the other tune name were to appear in both contexts, and if a search for the other led to some sort of explanation that they are the same tune.