Caution; car story,
I got a tour of a car collection that had four 426 hemi cars, the owner flew in the Mopar certification guy to confirm originality and document them. After returning with lunch the cert guy asked if he purchased two of the cars from the same person, apparently at some point the two cars had their engines swapped. They were bought in different states from different owners and yet ended up in the same collection, parked side by side.
Engines were later swapped back and cars are numbers matching again.