This question:

https://superuser.com/questions/362847/can-any-of-the-diff-grep-utilities-do-a-file-grep

Was voted for close as an exact duplicate of 

https://superuser.com/questions/8223/duplicate-file-finder

The OP suggests that while the answer is the same, the question is different.  The original question specifically asks for two features, whereas the new question asks for a different feature.  However, the answers provided to the original question includes the different feature asked for in the new question.

So the questions ares slightly different but the answer works for both.

I contend that someone searching for the answer to the second question would come across the first question, and find their answer even if it wasn't what the first OP asked for.

I do see what the OP is saying, I just don't see what value the new question has to SU.  It seems to me that the original question could be edited to incorporate the new requirements to make the question more valuable, but that compromises what the first OP was asking for.

What is the best approach here?