IMO, not that much.
Having an additional colony wouldn't immediately change neither Spain's fate on the world stage, nor solve the problems it was facing back home (they're still stuck in the Thirty Years War at this point).
Small butterflies on a superpower tend to have huge waves at the end of that effect.
On this ATL, Spain acquires Formosa. According to this TL, Spain acquired Formosa because of Gold. Gold which can be used for other parts of the empire or fund other wars/policies by Spain present or future. Having Formosa means you have instances more prone to fighting China or Japan, present or future.
The governor was not tried and convicted. He and his supporters can influence politics back in Spain or any Spanish colony he and his supporters has influence.
A good pattern is the British. What happens if UK did not colonize Canada and/or Australia? Wouldn't that effect world history due to the British at one point was the world power?
Another would be the USA. What if the USA did not liberate Cuba or did not make Hawaii part of USA? Wouldn't this butterfly history however small that starting PoD is due to the fact that USA is a world power?