That would be more or less consistent with my experience. I've only ever flown US aircraft wih US engines, but with the exception of the normally aspirated ones which can't be over boosted, they all required some retrain. The R-2800 on the DC-6 could easily be overboosted, and the Allison on the L382 is protected from overtemp by the fuel control, but it is certainly possible to over-torque it in cooler temperatures. I wasn't aware that British installations were set up differently