The DOHC NA has similar mains to the SOHC 12V. The turbo after 1993 has 4 bolt as do the 3.5 and 3.8 engines.

There are changes to the girdle in each engine but these are minor.
Other than the Sport engine there was another change to the blocks in 2001 as far as side bosses and oil pumps.

Cheers, Charlie
If It ain't broke, Modify it!
87 Montero turbo Converted back in Spring1989
95 Montero SR 3.8 DOHC Only one?
93 Pajero 3 door 6G75 Mivec with paddle shifted 5 speed
Then a Gen2 SR with full coil independent suspension.