In the saab the power setting is set by % torque for current conditions, i.e. altitude, oat, whether or not anti-ice is being used, and prop RPM. Though that setting can be limited due to ITT. So for example set both engines at recomended torque and if one engine is exceeding an ITT limit, pull the hot engine back until it is within limits. So to answer your question in the saab we match the torque, but I don't have any experience on other turbo props.
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