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

I think you guys are making it too complicated.Wouldn't numbers matching mean the components that are referenced to each have to match?
OE would be all other original components...but they would not have matching numbers. An alternator would not have numbers that match anything it would just have a correct build date.
Need not worry about that for an A body.It's not a collector car and it's value will likely depend on it's quality.
A 440 six pack Cuda would not be very collectable with a 74 motor home 440.