The FMC will command the required thrust based on the temp. input used and the T/L's will be positioned accordingly. If you then need max. power for instance, stuffing the levers to the stop will give you max. power available for the day based on local temperature.
Modern engines are not like the old 'part throttle' motors that would attempt to give whatever it could only limiting RPM by the speeder spring and bobweights in the JFC.