How do you know if doors and steering column and shaft are original 1998 jeep Cherokee?

How do you know if doors and steering column and shaft are original 1998 jeep Cherokee?
There is no way to tell on the steering column, I'm assuming your wondering why the ignition key doesn't match the door lock key, in that instance there is no way to tell, the car could have been re keyed on either for a multitude of reasons. On the other hand if your curious to see if the doors match the body then look at the drivers lower corner of your dash there will be a vin number easily visible through the windshield. compare that with the vin stickers on the doors and that will give you your answer.