Well, if you follow the thinking, they joined them because in the episode Where No Man they are joined
for their first usage -- I presume that would be the pilot version of Where No Man with the different titles and Act markers but it may well be the same in the syndicated version.
BTW, the cue at the end The Lights of Zetar teaser is Track 27 of the GNP release. I was able to sync it to the soundtrack of the episode exactly. I thought it might be a re-recording, but it would not have synchronized had it been...