I don't know if Remington has changed the 410 primer to the Kleanbore name or not. If you look at the Rem. web site under shotshell reloading all they list now is the 209 STS Premier Primer and no other primer. Also not long ago someone here had posted D&R had the Rem. 410 primers. Well they no longer have them on the web site, or it is not shown with the other Remington primers. All they have listed is the 209 STS Premier.
My thought is the 410 Premier primer is no longer available, since it is not on the web sites. The 410 primer could be the same primer, billed now as the Kleanbore primer. I'm guessing there are probably more people shooting muzzle loaders than there are people reloading 410 shells.
Who knows mabe the Kleanbore primer is a new design to address the crud ring problem. I never really had a problem in my Rem. 700 ML. I'm glad someone is advertising a primer to help reduce the crud problem.
I guess we will shall see soon enough,
Stan