a stock 1.9 diesel would be heavier as it is bigger...210mm
a 1.8 gasser maybe the same or similar weight. All you need to do is swap all the parts over. 18psi not intercooled is a bit much for that turbo I think.
ABAs got heavy flywheels, along with AAZs
1.8 flywheels are lighter than diesel flywheels..
gasser flywheels are lightest, then comes stock diesel wheels, then the heaviest ones are off the 1.9 and 2.0..