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

To ME (not everyone's opinion) a numbers matching car has the original engine and trans that match the Vin and body numbers (and fender tag.). I'm not anal enough to look for date codes or part #s on stuff that gets replaced when it wears out (hoses, alternators, belts, water pumps, etc.)
Is it numbers matching, if it has the original engine.... and headers and turbo mufflers? In my opinion, YES.