I haven't heard the Sunrays' version - but the same version on All This is That was on Get the Boot, with studio chatter about "Carl and Brian vocal up in the mix," which would certainly indicate this as a beach Boys track. Did they use the same backing track and overdub Sunrays vocals on it to duplicate the BB version? Or use the BB backing vocals as well, so the tracks sound similar? Or even erase the original Carl/Brian vocals on the master and replace it with the Sunrays, so that the Sunrays version is the only one that exists now?
I don't believe the BB's version got any further than the rough Carl and Brian demo heard on other boots, and to quote from the Sunrays liner notes:
Rick Henn: "Murry wrote 'Won't You Tell Me' for the BB's a few years after The Sunrays broke up, and he asked me if I would arrange it for him and cut a demo. After I finished working out the band and vocal arrangement we booked a session at Sunset in Hollywood. Just as we were cutting the tracks who should show up but his son, Dennis. My immediate thought was "Oh God, here we go. He's going to move in and start changing the charts and make my life miserable". Quite to my surprise and relief he was very gracious and simply said "Gee Rick, I love the chords, I like what you're doing with the bass line, but I want to try something ...". I said "sure Dennis, let's give it a shot".
He had us record some guitars and piano rolling chords down one octave than usual with the tape machine at half speed and then when we played it back at normal speed it shot everything back up an octave and gave it a simmering mandolin/string bowed tremelo effect in the background. When Murry heard it he went through the roof; he just LOVED it and remarked "ooooh ... the strings!" He was so proud of what his son had done for his song. Then Dennis, Marty DiGiovanni, Don Ralke, Ray Pohlman and myself went on to do the vocals. Murry poured his heart out writing that song because at that time he was worried for his sons because they were having trouble getting a chart record ..."