Sailboatdata.com is a GREAT web-site, but far from perfect! He gets his data from various sources, but doesn't always verify how acurate said info is.
To the best of my knowledge and research, O'DAY never offered (officially at least?) the tall-mast with the K/CB. The Tall-rig only came with the Fin-keel, 4'6" draft and mast was 2' taller. We could check with Rudy at D&R to be sure. I do know that there WAS a "Tall-Rig" option for the K/CB O'DAY 23 in 1974, not sure about earlier years.
There is lot of info posted online and in books that mixes up details for many boats, creating versions (on paper) of boats that were never offered by manufacturers.