I had been told the turbo i had on my 2tg was off a diesel truck, it only had oil cooling, not water as well. Also the wastegate diaphram was bigger on mine than the petrol CT20's
It boosted qiute early about 2500RPM and was beating some friends with similar engines and more boost.
So all i can say is yes it should bolt up, How it will go will depend on how the rest of the package works.