I don't know, but I wouldn't be surprised if black Koolstops aren't really much different from generic bog standard compounds from other manufacturers, that don't brake any better and pick up more grit. It's rare to find any grit or metal in my salmons, unlike everything else I've ever tried.
Anyway I recommend salmons for the dry because they're very good in the dry, regardless of what they were designed for. Braking tends to be most excellent after they've "conditioned" the rims (which I think means depositing some brake pad compound, not just powderising the aluminium rim, which by itself is counter-productive. It can take quite a while with new or newly cleaned rims).