Agree with above ... don't worry about getting mixes correct.
In theory - two different ESC's should act same ... but its better for peace of mind to have same. Ok - CURVE ... no its not Expo. If you look at Helicopter mode - you will find a section in programming called CURVE ... it can be used to alter way the throttle acts ... how collective acts etc. Example ... (please Heli guys this is just example) .... you could set a curve so that in first 5% of throttle you get 25% throttle ... with full throttle at say 40% and all way to max. This then means rotors are max throttle but collective pitch the acts to lift etc. Instead of having both going up in linear fashion ... not something you want. Makes for difficult to fly heli's !! On your plane motors ... you could set a curve for the rudder so that you have 0 one way and say 25% other ... only problem is for a curve - it would need motors turning same direction ... I think !!
I'll fly anything if I can launch it ! Youtube : solentlifeuk