<p>It doesn't really sound like you are [would be] asking a duplicate question.  I think a <em>useful</em> way to define a duplicate question isn't a question that uses some of the same terms, backstory, etc., but a question that would be answered by the answer in an existing thread.  If that isn't the case, the new question shouldn't be considered a duplicate, in my opinion.  Consider the boilerplate text I sometimes add as a comment when I vote to close a question as a duplicate (taken from <a href="https://stats.meta.stackexchange.com/q/2468/7290">here</a>):  </p>

<blockquote>
  <p>I think you will find the information you need in the linked thread. Please read it. If it isn't what you want / you still have a question afterwards, come back here &amp; edit your question to state what you learned &amp; what you still need to know. Then we can provide the information you need without just duplicating material elsewhere that already didn't help you.</p>
</blockquote>

<p>If the information at the other thread is different from what you need, then it shouldn't be considered a duplicate.  </p>

<p>Therefore, what you need to do is just make that sufficiently clear.  For example, what you have written in your first three paragraphs makes what new / distinct information you want to know pretty clear to me.  </p>
