Utopia vs Dystopia

Can the two be interchanged in one situation? I'm sure it's fairly obvious which is which when there is an intention behind the creation and existence of the utopia/dystopia, but what if that isn't even the foucs of the story? What if the intention was that the world of reality simply did not make room or give enough creative license for a story, and a created world was needed? Then I guess the nature of the world wouldn't matter anyway. Still, if one were to identify a dystopia or a utopia described in a bit of fiction, could there still be ambiguity?

That's just something that pertains to what I'm writing. As you can see, it's a horrible hour to be thinking deeply. There's such a strong intrusion of dreams into my stream of consciousness. Othwerise, I enjoy the night/early morning very much. I am a night owl, after all.