I'm glad you asked about this because I saw the same question come through and tried to close it as a duplicate of the earlier one with the same result as you.
I just saw this Meta SE Q&A (Is it OK to post a duplicate of a question that didn't get upvoted or any accepted answer?) and it got me thinking.
The way I think I will handle such a situation when I next come across it is to propose closing it, not as a duplicate, but for the same reasons proposed for closing the original, and just comment that it looks like a duplicate of "...".
If there are no grounds for closure then I'll just make the same comment, and treat them as independent questions (which I do not have to answer or comment on) until one gets an upvoted or accepted answer, and then propose closing the other(s) as duplicates.
I think asking the same question again is always grounds for a downvote too.