Should questions with similar descriptions be closed as dups, even though the cause or problem may be different (and not covered by the previous question)?
For example this question how to eliminate the whooshing sound of water running though pipes, was caused because the main water shutoff valve was partially closed. Then there was this question opening water pipe tap has hissing noise throughout the house, which was caused by higher than normal water pressure.
The initial questions answers only focused on valves, and did not mention pressure at all. What is the best way to handle this situation? Should the second question be closed, and any answers that would have been provided to it added to the first question. Or should the second question stand on it's own, as a similar but not exact question?