Click 23 you are correct. Remember, as TVR1 explained some time ago, the Chattanooga/Hamilton County SmartZone mixed mode system is now a site of the TVRCS just like Oswald Dome, Evensville, or the NW Georgia simulcast cell are sites.
As you noted, you can basically take the list of talkgroups on the Chatt/HamCo system, divide them all by 16, and get the talk group IDz for the TVRCS.
This does indeed work for the Catoosa County groups. On the Chatt system Catoosa SO is 33104, and on TVRCS it's 2069.
But outside Hamilton & Catoosa counties the group numbering is all new.
BG..