If two story-identification questions both have the same answer, and that answer has been confirmed (on each question) by the querent in the form of acceptance or a confirmatory comment, one of the questions may be closed as a duplicate of the other.
In most cases, this is quite straightforward: if the answer to one question is "All Summer in a Day" and the answer to another question is "All Summer in a Day," then they are duplicates, and may be closed if the OPs have confirmed that they are the correct answers.
But there's some ambiguity here.
In particular, if the answer to one question is a series, and the answer to another question is a book in that series, do those constitute the same answer? What about when the answer to the first question is a different book in the same series?
If the answer to one question is a short story, and the answer to another question is a film based on that story, are they the same answer? Some questions have been closed as duplicate under this reasoning.
In short, are two works ever closely related enough to close their respective ID questions as duplicates? And if so, what are the criteria?