Good question ..
Now from what I know. .
The compliance have the size of the motor on them ...
The motor has a built date on the block and the engine numbers have to roughly coincide with the compliance plates year of manufacturing. ..
There is no engine number on the compliance plates to say that motor come out that car. ..
I think the only way is to have the original sale document that has the order template of the vehicle that has everything the vehicle is and has on it.
In a nut shell is this correct ?