I think your question is a "good" duplicate in that it comes at the problem from a different angle. However it is still a duplicate. The answers are the same as for the other question.
Having a question closed as a duplicate is not a bad thing. If your copy had identical wording or was otherwise a "bad" duplicate it might eventually get deleted. That's not the same thing as being closed.
Closing duplicates just helps ensure that all the possible relevant answers to a given problem are in one place. Duplicate questions can be good but there is litte sense in duplicate answers.*
The exception would be if the answers to your question were going to contain content uniquely tailored to your significantly different issue. In this case I think knowing the other answer is going to lean you and anybody else that lands on your question to be able to solve their problem. If for some reason you need help inside your unique context that the other question doesn't cover, feel free to request that it stay open. You might want to edit it with specific enough wording that it is clear how you are looking for a different answer.
* Note this is a point on which I don't 100% agree with Jeff.