Also lying (fake bomb threat) is a big difference.
It's like the difference between someone stealing your wallet, vs. letting you play some kind of street game where you don't actually have a chance of winning.
The method employed matters, it's not just about the final result.
Today's hijacking: the result was that the journalist was arrested and now may be facing the death penalty.
The denial of flyover rights to Morales' jet: there was no risk of capture to Snowden - worst case, he'd just have to back to Moscow. If he had been on the flight.
Yes, there was obvious BS from Morales' pilots about uncertain fuel readings - if that had been true the actions of those EU countries saved the life of Morales and others onboard.
Both situations are crap.
I see it like: egomaniacs running those 2 governments, bad.
They forced the plane to land by locking all airspace around it. And yes, they would also have started fighter jets if the plane would enter the forbidden airspace.