The answer is — No (in most cases), Yes (in exceptions).
If you have your design submitted in a contest and it's been awarded, you can no longer use the same design for any other contest. This is because it would create legal issues concerning the copyright.
In such cases, we don’t allow the submission of the same design to different contests.
But there is an exception! If your submitted design hasn’t been awarded or is a non-winning, you can withdraw it from an earlier contest and submit it to a new contest.
We recommend you get in touch with our Support Team to withdraw the design on your behalf if you're unable to withdraw on your own.
(Note: Please make sure that your design matches the client's needs and is in accordance with their design brief.)