Since it is an MB, the numbers wouldn’t match anyway. There have been a few updates.

https://cleveland.craigslist.org/cto/d/elyria-1943-willys-jeep/7227880753.html

“For sale: 1943 Willy’s Jeep
“Go Devil” engine is rebuilt by Ron Fitzpatrick a Willy’s Jeep Restoration Company
Engine and body don’t have matching numbers.
Very low miles on it.
The frame is unmarked.
Gas filler tube was previously added for convenience by the previous owner.
Transmission has had all oil seals replaced by professional rebuilder.
It is a 12 volt system.
Runs really good.
Great for off road fun.
$22,000 obo
Please no third party sellers.”