Oh man, so this is something my American Philosophy professor would have a field day with, because my instinct as an American is to say "It doesn't matter since the practical effect is the same", which fits in with the idea of American Pragmatism described in the late 1800s.
https://www.philosophytalk.org/blog/william-james-and-squirrel-exampleIf you were to engage the troll and non-troll in conversation and observe the non-troll having a different and more sensible reaction to challenges than the real troll, then I suppose the difference would matter, but if we assume their behavior is consistent in the face of replies, then it's immaterial.
However, I don't know what American Philosophy has to say about the case where the person posing that question is, themselves, trolling in a way, lol.