Hey Nenad
Good Googling! Never seen those graphs before. I did a ramp test on a calibrated Computrainer last week, and this is what the curve looked like..

'Looks' a bit more like a Jetfluid curve. May be real, may also be a bit of marketing to say 'our new JetFluid pro is more progressive with a higher top end, so you should spend a few more bucks'. That curve is not really compatible with the real world anyways.. no weight, no position so its just illustrative - perhaps you need to ride the Fluid2 in the drops and the Jetfluid up on the hoods :-)
All I can really say is that the trainers feel identical to me, but suppose I'm in a different boat to you with power in the crank, so don't really mind how quickly my back wheel is spinning.
ITO zones, I'd go by speed-based RPE zones if I were you for now, or HR, or just plain RPE. Consistency is whats important here, and speed will be consistent.. just need to take a few sets to get it dialled.