WS does indeed sell CARC paint (that's where I buy mine), but Hentzen came up with the powder. I'd start by calling them.
You haven't stated your application but my guess is you want something to match - in which case it may be simpler for you to find a PC supplier that just matches the paint dye. The colors are all standard. I am a big proponent of real CARC paint, but, mostly because you can spray it over old CARC as a base, it has a unique finish and texture property, and finally, the newer CARC formulations fade less in the sun than the competing paints. For PC... it doesn't seem to have any of these benefits unless you really need to decon it or whatever.
Free advice, if this is going to be in the weather, I'd look into the UV fastness of whatever you use (including CARC PC)... The different CARC products seem to have wildly different fade profiles so it doesn't seem to be something the military takes seriously when they are specifying the products. You may find the CARC PC is worse off than a civilian coating.