Federal includes not just all the Federal brands for ammo, but their primers and the Alliant brand of powder. (Think Bullseye, Unique, Power Pistol, etc.)
CCI includes the Blazer brand.
Remington could be a black hole. Their primer production wasn't doing to well to begin with, then the Flu and the bankruptcy. In order to keep the Remington ammo brand alive Vista might have to utilize Federal and CCI primers.
All told, buy when you can, hoard what you can. It's going to be a long dry 2021.