This issue arises with this question.
Theoretically, there can be an unlimited number of questions of the type-
Find the solution to a magic square with each side and diagonal adding up to X.
Of course, we don't want to fill the site with the same question with slight variations. In many other cases, we could close it as duplicate with an appropriate question. But, in this case, this isn't an exact duplicate of any appropriate question and I can't see any other appropriate reason to close.
My suggestion is: create a standard question of this type and use it as reason to close as duplicate for future questions. This one comes pretty close to it. But I'm not sure if this is a perfect referral question.
I am of course talking only about standard magic square puzzles. This post doesn't apply to puzzles with a twist or extra constraints.