If something has higher compression ratio then it cannot be nearly identical.
There are many ancillary devices that are different.
Eg. intake and exhaust manifolds, injectors, fuel pressure regulators, exhaust valves in the cylinder head, sumps, pistons are different on some models, con rods are different on some models, cams are different on some models and valve springs are different on some models.
The best of all the N/A’s is the latest model.