If it's a different question, you should use an (at least slightly) different title.
When you go on to ask a question on a Stack Exchange website, the tip above the title field tells you to:
Be specific and imagine you’re asking a question to another person
If you find yourself wanting to re-use the same title of one of your other questions, chances are, the title is too general, to begin with, and shouldn't be used for either of the questions. Remember that the title of the question is the main tool you have to get people interested in the question.
So, your goal is to use a title that is interesting, specific enough, and not too long at the same time (there's a body field to include more information as you indicated).
- DO search about the problem first and make sure your question isn't a duplicate.
- Do NOT use the tag name in the title (that's what tags are for).
You didn't use any examples so let me provide one. Suppose you have two questions about using an array. Instead of trying to ask two questions with this title:
..consider using something like:
How can I get an element from an array by index?
How can I remove an element from an array by index?