I expect the turbo oil supply and drain lines are different as is the exhaust pipe from the engine compartment. The valve cover breather hose and air cleaner are definitely different.

The turbo will have an ARV you probably won't need unless you transfer the emission control systems. A non-ARV turbo or compressor housing should fit but you'll have to modify the hose from the air cleaner. You'll have to do that anyway if you don't use the California air cleaner and it's $$$ air filter.

Sixto
87 300D