yes and no. if you fit the pre 98 cg10 flywheel, you will also need the pre 98 cg10 gearbox, im not sure if the post 98 flywheels will be any different cos there the same clutch after 98 i believe.
so yes you can use the cg10 pre 98 flywheels as a lightened equivalent but you will need the gearbox also cos the clutches are different.