I can add some info to this.
The CBJ sessions were recorded in 1971 on what amounted to "hi-def" sound technology... on 70mm multi-channel film. These were then mixed down into the LP version which is more or less the version from which all other versions are sourced.
There isn't much of a market for CBJ soundtracks, to be honest. In the late 90s the Disneyland Tiki Room switched over from analog to digital, for which all of the old tracks were transferred out of the WED graveyard. This means that WDI had a full stereo version of the soundtrack on a computer somewhere ready to go to be sent off to be put on CD. This is why stereo mixes of Tiki are common.
The big chance for CBJ came in 2005, in the lead-up to the Disneyland 50 box set. Tiki Room used the 2005 re-master of the digital soundtrack, but both CBJ and America Sings used improved transfers of the old LP mixes with some reverb laid in because transferring all of the magnetic tape and re-mixing the shows from scratch was cost-prohibitive.
Finally in 2009, WDI got a budget to re-mix CBJ and had to go back to the 70mm recordings as the only source they had on file was derived from that mono LP. This resulted in a slightly different 2009 version of the show soundtrack, with slightly different choices in terms of editing and instrument choice. This is most evident in the moments following the end of "How Long Will My Baby Be Gone"; the original mix used drums while the new version brings a wobble board forward in the mix. In 2012 this new mix was used as the basis for the cut-down version of the show. Presumably a clean copy of the new mix is ready to appear on future releases, but there hasn't been any in years now!