Hi topelios,
with the EC155 - the difference is remarkable.
(I have videos from the simulator - but not cut by now and not quite sure, whether I'm allowed to make them public)
Speed always have the square in the formula - look for the brake way of a car with speed 50 km/h and 58 - its not only 1/6 longer as expected, (dependeing on factors - without reaction - MS tires its 17.5 meters to 23.5 meters)
So the additional energy in the head is a real factor.
But if curious - and with no simulator at hand - why not take an IP, a very light helicopter, may be before or on an technical trip - and check it out - go in the hover OGE, first with RPM high, check, that TQ won't hit the limits (thats what the light helicopter is fore) when retarding an engine and put one engine to idle and look what happens. (a videocamera would be handy to record RPM drop) - and don't touch the controls (pitch), only if really necessary - just pretend it hits you on surprise while looking outside.
After putting the engine back, select normal RPM and then put the same engine to idle and see what happens, even with the now lighter bird (burnt fuel).
Surely, before doing that, you should check the charts, whether OEI OGE hover is possible.
Look for RPM drop, height loss - and use the chance to practise a fly away.
Surely there will be a difference with a heavy helicopter with more TQ pulled to hovery - the RPM drop will be greater, because there is more power required from the running enigine.
After that come back to the forum and tell us, if there is a difference to the theory or between N3 and EC 155.
Greetings Flying Bull