Exactly what makes a MOPAR a "Matching Numbers" car?

I liked FantomWorks in Virginia Beach, run by a retired USN pilot (hence name). Not only do they show the steps and do practical rebuilds, they detail the bills, which may blow your mind. I recall most bills were ~$80K for a basic rebuild - paint, mechanical repairs, interior, no Mark Worman "correct" restorations, no Mike Foose resto-mods, nor Garage Squad "rip out engine, big-block in" (and who pays?). Most customers were paying such prices because a nostalgic car, like their first car, or from first date with spouse.

One FW episode replaced upper ball joints on an A-body. The mechanic used a torch and a pipe wrench, not knowing about the special socket (I have both sizes). At least he knew they unscrew. They dropped the show, stating that filming was too invasive to the shop work.

I don't watch any now, not from lack of interest, but rather dropped cable for streaming (Netflix, Prime, ...) and most shows are now behind the MotorTrend paywall. I only find old Wheeler Dealer shows when they began in England, and seen all. That was a good show and I think got better after the move to L.A. (Mike Brewer retreated since to U.K.), and even after Ed China balked and left for lower tech content. Anthony grew on me, though dialog with Mike was a bit cheeky, and now Ant has his own show in L.A. Car Fix in Tampa was good with the original duo, and the Girls show in same studio was good (shows run by Garage Squad guy). Perhaps the worst were the Desert Valley, AZ junkyard show and the Miami flipper w/ gold chains show. The former had a Barracuda rear window sitting on a stand and kept talking about how expensive it would be to replace, then amazingly it fell to the ground and shattered, with cameras perfectly staged to catch that. The later shop had some suspicious circumstances I read about later, like a large fire and insurance claim, and don't recall that fast talker ever fixing the cars anyway.