Yeah as stated, the only thing the numbers match is the owners book, which might not have even had the numbers written in it correctly. My WB was registered with a typo in the engine number for 25 years.
I am fairly sure that some of the vehicles that had bodies and assembly in seperate plants, had numbers on tags and chassis that are not in line.
Then to make it even more ridiculous, people are fitting date coded blocks that have completely incorrect engine numbers, that people are gong to think are original engines in years to come.