I just reviewed an answer from a new user new user covering the same explanation as another already posted and more developed answer. It is not the first time I come across this situation. Normally, it's because people posted almost at the same time. No need to bother since it's not done voluntarily in these cases.
Although I'm not calling it plagiarism because the answer is too short/simple for that, do we need to have 2 identical answers?
Is my definition of plagiarism too narrow?