Different "trim", usually a higher wastegate setpoint (eg 15 psig). Because a diesal produces less exhaust mass flow and the turbine needs to provide more torque for a given engine displacement than a petrol one, you should tend to ballpark a suitable recipient petrol engine at about 66% displacement of the donor diesel.
Of course if doing the maths then A/R, trim, etc will be specific to your engine.
I have succesfully used diesal turbo's on petrol engines and prefer the higher wastegate setpoint to give me less throttling range for closer pressure regulation in the twenties.
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