ScottG wrote:
"Also, Knock, ping are all exactly the same thing. You are alone in your suggestion that they are anything else."
Not really. (I'm with Gdetrailer here) Clearly pre-ignition and detonation can have similar symptoms/effects, but, their origins are different.
Forget Wikipedia, I suggest you obtain/read a copy of "Internal Combustion Engine Fundamentals 2E" by John Heywood, 2019 edition. The above is a college level required textbook for most accredited Mechanical Engineering Programs/students. Reviewing some Schlieren photography of active internal combustion chambers would also be helpful.
To the OP, you can check your catalytic converter by tapping it lightly (when cold) with a soft mallet. If it sounds like marbles rattling in a tin can, . . . . you need a new one.
Chum lee