I think that the only thing that matters is the extent and the quality of an answer, not whether it's accepted or even its votes.
The fact of the closing as a dupe merely means that the information already exists and shouldn't be duplicated.
So, if the question is fully and exhaustively addressed by another question's answer, VTC as a duplicate, no matter whether the duplicate info is in an accepted answer or zero-score one.
- NOTE: however, where the acceptance matters is to the readability and find-ability of the information you are trying to avoid duplication of. Therefore, I would second Jimmy Shelter's recommendation to link to any answer that isn't accepted/top-voted via a comment; just to ease future readers' search.
Conversely, if the existing answer kind of touches on the info, but it's buried deep inside an unrelated answer; or, even more importantly, if the info isn't really complete (meaning, a new answer to a question you're VTCing is likely to be much more complete and better), then do not VTC - again, without regard to other answers' accept status or votes.