I don't know what KZL sounds like now, but they had quite an erratic playlist a year or so ago...almost more like a Hot AC/CHR/AC (they played some new stuff not even HAC would play) hybrid. They went pretty far back. I would assume they attract a decent amount of listeners who are too old for most CHR's, or a Hot AC audience. Kiss still plays 90s music, and plays quite a bit of gold.
When was Kiss really that rhythmic? I don't get them that well so I don't really remember, but I normally remember them being pretty adult friendly, definitely before Channel - I remember they were one of the first CHR's I heard play "Haven't Met You Yet" by Michael Buble a few years ago, FWIW...and they're still less rhythmic than CBS's other CHR stations outside of Detroit...
I can't describe how Kiss sounds vs. Channel - just cheap, I guess...Channel sounds very upbeat, bold, big market - Kiss just can't seem to keep up in sound. IMO, if it was that great of a station, they could have weathered the loss of Ace & TJ. Obviously a lot of listeners liked their show more than Kiss overall...