For most camshafts, that's true. For the old MP camshafts though, you could not make the .050" comparison with another brand camshaft. They measured theirs a different way.
Nowadays, I don't know where the heck they're measured from. They are all over the map due to poor production tolerances.
I think back when they were actually "good quality" that they were hard to map, because Mopar wanted to keep them proprietary. I have had some map right and then some smaller and some bigger than advertised. Sometimes by a good margin.
