Using the Manual Override may push the Fuel Metering Valve all the way to the Maximum Fuel Flow position.
Then again, it *MAY* not.
One very good reason it may not is engine preservation. The EPL is there to get you to an airstrip should there be a failure of the FCU pneumatics at some time after takeoff. It is not there to give extra power for obstacle clearance.
It is very likely that the pilot's ability to rapidly destroy the engine has been limited - deliberately - by Cessna.
On the PC12, the EPL is called a MOR (manual override), and you cannot get anywhere near full power with it.