I gave you an example, a real world example of two almost identical combinations taking two different converters. I can’t speak for any other than PTC, but I know when you call them they don’t have one “on the shelf”. Two identical 9.5 inch cases with different internals.
It’s the same with cams. You call Comp their job is to sell you a cam on the shelf. You call Racer Brown, or Bullet, or Cam Motion and they pick the lobes, the LSA and that’s what makes the difference. Jones too.
So they are custom converters and cams.