[Gatesy]

If the VIN codes are the same then that means you won't have to put more work into in than you have to and you can just swap the engine.

Quad 4 High Outputs (have a manual transmission) are VIN A (8th digit of the VIN is an A)
Quad 4 Low Outputs (automatic transmission) are VIN D

If you try to put a high output into a low output car you'll have to swap a manual transmission, but I'm not sure how the manual from a high output would do with a low output engine.