I did some testing and compared those two models in IL-2 with the most recent data sheets I could find for those two models.
Testing in IL-2:
Engine and Radiators set on automatic
Map: Rheinland Autumn
Indicated Air Speed converted to True Airspeed rounded down (since we ufnortunately dont have TAS Indicator we can enable in the game) via http://www.hochwarth.com/misc/AviationCalculator.html
The Curves (or better the line) for the models from the datasheet