I don't have close vote rights on MSO yet, but since I do on regular SO, I am familiar with how the close votes work. I can tell when there's an auto-generated close vote comment that looks like "Possible duplicate of <link>" that there's been a close vote cast for this question with that as the proposed exact duplicate.
I also know that when I flag a question I can choose "does not belong here" and essentially "cast a close vote" as well, but with a flag instead of a close vote. Since my name doesn't show up in the "Closed as" list after this question is closed, I assume it doesn't really translate to a "close vote" even if the flag is accepted.
So my question is - if someone with the right privileges has already cast a close vote on a given question, is it even worth flagging the post with my not-really-a-close-vote flag? Does it just fill up the mod queue unnecessarily?