Don't know why you apologise, BB!
Theoretically two way radios are forbidden in SANParks at sightings etc, but doesn't seem to happen...
The guides have or will have quite a clever system where certain areas are demarcated into "colour" blocks, so the "blue" block will operate on their own frequency, the "red" block their own, etc. This means less pointless chatter. Not sure if all companies share this, but the umbrella body has adopted it, so they should?
SANParks is also privy to these channels, for emergency purposes.
I don't know about listening in, one could ask a company, but I doubt they would agree...may organise something special for AW members!