Kurt, they're two totally different products. RC (Raritan "Concentrate") is primarily a deodorizer that is diluted in water and metered into the toilet a little at a time, with each flush. It has some lubricating ability and also has a certain amount of disinfecting ability, although it isn't advertised or sold as a disinfectant.
"CP - Cleans Potties" on the other hand, is a bio-enzymatic toilet cleaner and is often used in conjunction with "KO - Kills Odor," which is a holding tank additive. CP and KO are perfectly compatible. KO uses live bacteria in solution to break down and liquify the holding tank's contents.
However, RC is not compatible with either CP or KO - each will neutralize the other, so that the net result becomes - "nothing at all."
If you use RC, don't use either of the other two products together with it. If you use CP or KO, don't use RC with them.