I belatedly realized that a fairly recent question is very similar to an older question. However, the recent question already has an accepted answer (disclaimer: mine) and the older question does not.
I'm not quite sure what to do. Aaronut's answer in a related meta thread states that:
If you see a new question that's a duplicate of an old question, voting to close usually covers it - most of the time, the question will get closed before any answers get posted - or at least any answers worth keeping. In that case, merging is fairly pointless...
That apparently didn't happen here, and I do hope that my answer is worth keeping. However, Sobachatina's highest-ranking answer to the old question has a lot of good information too. I'm further thrown off by another statement from Aaronut:
It's very, very rare for a moderator to merge questions that have only been recently closed, and almost unheard of to merge questions that are still open (I'm not even sure if it's allowed). That's because its dupe status may still be in dispute at that point, and merges can't be undone like closures can.
I find it doubtful that there's any dispute over the status of the older question at this point, but it looks like merging may not even be possible here.
Does this situation merit further action? If so, what's the best solution?