In the most extreme context it means all the casting numbers and parts numbers are correct for the restoration meaning they are the actual authentic factory or factory replacement parts that were installed on that model when new.
I don't care about matching numbers.
I don't want a car with good taste I want a car that tastes good
matching numbers really only matters if:
1) The car is rare
2) The car is a special model
3) The car is in high demand by collectors and has great investment value
In some cases an unrestored original in fair condition with matching numbers may be worth significantly more than a fully restored gem
The worst case of unmatching numbers for example would be a Mustang my friend bought with 3 different VIN numbers throughout the car...
Nobody cares if a ford pinto or an amc marlin has matching numbers except for the occasional wierdo lol
I'm waiting for "That Guy" to give me grief for turning my ratty old decrepit 63 skylark special into a 1960's drag car replica... showroom cherry versions of my car with top options and in a convertible model only sell for $6,000 to $8,000 so who cares right?
it's probably going to be some guy who expects you to spend 10 years and $100,000 doing a car "right" that he wouldn't want to spend $6,000 on and then he's going to die some day and no-one else will care
Some people are weird
Or dumb
Or both XDDDDDDDDDDDDD