I'm wondering if it doesn't make more sense to close the earlier duplicate, if the earlier duplicate is unanswered.
As of now, I think, we close the most recent duplicate, regardless of answered-status.
But that more recent duplicate is listed higher up in the main page ("bumped" to use the words of the faq) which should drive more interest and potentially aid in answering an unanswered question.
I'm not 100% sure but my guess is that closing the more recent unanswered question reduces the chances of answering the question as compared to closing the earlier question.
Although I think they are not 'exact' duplicates (see my comment), I can imagine that if a proper answer was given and accepted to the earlier question, it may have answered my slightly different question as well. In this specific instance, while I may not be using AudioQueues, it could indeed be the case that the answer to the question required AudioQueues (I don't know - it's why I'm asking). As it stands, the question is unanswered and my renewed interest in the question may serve to answer it.
In short, I wonder not only if the word 'exact' in the phrase "closed as exact duplicate" should be more strictly enforced, but also if it should only apply to answered questions.