Considering that capturing the Golden Snitch should be a difficult task in every game but it should also be catchable by the players (or the game wouldn't end): are all snitches made equal? Do they adapt themselves to the skill level of the seekers?

And if they do scale: how does that work?

In other words: would Viktor Krum have the same difficulty catching the Snitch in the Quidditch World Cup finals than in a regular Hogwarts game?