HI,
No, they behave the same. Firewalling gives you full rated thrust on the 737 NG (the classic can give more than full rated thrust overboosting the engine in the process), which is a very unwise thing to do when using a derate.
Here a quote from Captain Lim website (He is/was B 777 pilot):
How is an assumed temperature take-off different from a "derated" take off? A de-rated engine is a semi-permanent engine fix used to reduce the maximum thrust available. A temporary form of de-rating is known as a "T/O de-rate
"
Here a quote from Airbus article (smart cockpit):
Derated Takeoff procedure: pilot cannot recover TOGA.
Zeke (I guess he is Airbus pilot) said in another forum that there are 2 kinds of derate: Hard derate (similar to semi-parmanent) and soft derate (similar to temporary derate, known as “T/O derate”).
My point to post these quotes is to indicate that before stating that firewalling the thrust levers gives the full rated thrust we should mention if it is semi-parmanent or temporary derate.
Another quote from Airbus article regarding Bump activation:
The bump is activated by two guarded pushbuttons, placed on the thrust levers on the A320 Family and on the external thrust levers on the A340.
It can be used with all engines operating and remains active in case of one engine failure
.
Does it mean pilot can use the bump on the operative engine in case of engine failure?
Feedback appreciated
Regards