Survivor? original? Or numbers matching?

In my opinion, ( and I may be incorrect ) Survivor is a car that has not been restored, repainted etc. This does not mean that repairs and maintenance hasn't been done. A survivor may have an aftermarket water pump on it for example. Original is an unmodified car, low mileage, retaining most of its "original" equipment. It retains its "original" equipment as it came from the showroom floor. Numbers matching normally means VIN. numbers. there is VIN numbers or part of VIN numbers on the dash plate, engine, transmission, on the body on the right rear quarter on the trunk opening, and I m sure other places that I am unaware of. This is my opinion , nothing else. It is how I understand it. Keep in mind there are variants in the restoration game such as "period correct" which means a car that has a era correct set of Cragar mags, and Sun tach, an era correct stereo installed. People would buy these cars with steel wheels and go straight to the mag shop for wheels. Nobody back then really ran the cars in "stock" form. There are also situations where the car may have had an engine installed under warranty a year later therefore the date code may not be correct. There are many variables to consider but that is part of the fun, figuring out the history of your vehicle.