I've noticed from time to time that KJR-FM seems play the shortest version possible of some songs - I've wondered if they make their own edits for air-play.
Ironically when KJR-FM came back as 70's again (just around the time of C/Channel takeover), one thing I really liked was that they played some special versions of the songs (longer not shorter). KING, when doing Top-40 in the 70's, used to try to find unique ways of standing out ... and would often opt for album versions of songs instead of AM edits so it sounded a BIT edgier (kind of funny to say because in reality any real HIP people had long gravitated to KZOK, KISW anyway!).
That whole "art" of finding interesting things to do with songs seems to have disappeared long ago. Sometimes stations would do custom edits or remixes, sometimes drop special jingles over intros, or all kinds of creative staging that made the way they "presented" a song much different than all the competitors playing the same song. Today, we call all that "clutter" ... bummer.