If you adjust it to the league, then maybe yes, you could find there some similarity. Similarity in terms of that probably noone would expect Columbus to be that good, and their chance of winning SC are/were very, very low but otherwise no - Leicester City winning Premier League was simply unreal thing. There is much less parity in the Premier League.
Columbus is actually pretty deep team with scoring depth and capable goaltender who can be as good as anyone in the league. + rising group of defensemen. In short term, Tortorella is a coach who can do wonders for the right team. Also, you got player who is either breaking out (Wennberg) or having career year (Atkinson), or playing on incredible streak (Gagner). Is it sustainable for these players over the long season? We'll see. Wennberg is the least surprising out of the group, obviously. He's a young forward who was pretty highly regarded.