The Problem with Scheduling Quizzes

So I just finished a short quiz to build up on my stockpile so when I am busy, I don't need to worry about finishing a quiz for that month. I planned to release this quiz months into the future, yet someone has gone and released a quiz with exactly the same concept a few days after I finished mine. I always make sure not to release a quiz which is extremely similar to another user's, so this has me conflicted. I think the quiz is different enough since mine has more answers, most of which are different from the other user's. I am more worried about the fact that someone can easily make this concept, before I even release mine, and it will look like it was copied or I took their idea. At the same time I don't want to release quizzes right as they are finished since then I will have to the quiz under the pressure of having to finish it before the first of a month.

In this case, I'll release my quiz since it is different enough, but in future cases, I might not be so lucky.

I would love to here your opinions and some possible solutions to this!