I took some pics of the engine bays of the respective models for you -
1991 Bathurst winner by Biante (using old Kyosho mold)
1992 Bathurst winner by Biante (using old Kyosho mold)
Japanese Group A 'Kyoseki' by AUTOart
Japanese Group A 'STP Taisan' by AUTOart
Japanese Group A 'Calsonic' by AUTOart
R32 GT-R V-spec II road car by AUTOart
R32 GT-R 'Nismo' road car by AUTOart
I hope this gives you an idea of the respective engine details.
Cheers
Andrew