probably some thing similar to as of a body change Pajero. Chasis and engine number shud be the same and the cars urs.
What ive heard now is that body change now is only a term now they take ur car dump it, take the chasis and engine number off it, laser it on a NCP car and hand it over to you claiming a body change was done.
The only way to catch this tempering is with some kind of spray, they spray it if it melts the numbers been tempered.
If its orignal engraved the spray wont harm it.
In case of Land cruiser i guess the chasis number is on the A-Pillar which has to be the same in case the car goes thru a body change
This is what i got to noe real facts might differ