The war was between European powers and had many ramifications in different places. For Catalonia the net result was that it lost its political institutions and became a province in a centralised state.
Also, is it historically accepted that, if Charles had won, he wouldn't have done the same to the other regions with fueros / constitutions?
It was still an absolute monarchy with the same monarch; it's not like the Aragonese were free to choose their own destiny. Still, the Constitutions Charles promised them to uphold must have given them something, I just don't know what it was. That's why I'd like to know how they compare to the current rights granted by the autonomía.
Of course this put severe conatrains to the royal power, and the Habsburg had been trying for a long time to get rid of the Fueros and it was the first thing the Borbons did when they took over the Corona.
> nobody was above it.
It's not like there was an independent judiciary branch with the power to enforce that against the nobles or the king. Case in point: the king decided to eliminate them and he just went and did it.