I can confirm your observation. I checked myself and also found differences in some ski regions well known to me. However, the declaration of the ski regions oftenly does not give a correct difficulty rating of their pistes in order to look better (more difficult) in comparison to other regions. With the regions I checked, i found different pistes marked blue which I would describe myself being of blue difficulty, which however officially are marked red. Maybe they took 'experienced' data instead of official?
But over all the Winter Activity Map also comes with a quite good topographic map (exact single building in Austria e.g.) as well for free. Unfortunately the contour lines I found only every 100m, but at cursor position you always get correct values of the level above sea.
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