Compare this hymnal: first lines vs. text authorities

Is there some way that you can tweak or toggle the comparison feature to go by text authorities rather than by first lines? I was just looking at comparisons of CoCS2013 with GG2013 and CGH2010, and found that it counted CoCS2013 #53 and #54 as matches with CGH2010 #706. But CoCS2013 #53 is the Ken text, and #54 is the Wren text, only the former of which matches the Celebrating Grace #706 (though to make matters more confusing, CGH2010 #707 is also the Ken text, so CoCS2013 should perhaps appear twice to be fair. Here's a screenshot of what I was looking at.