I can sell the same product on another web?
As an author on Envato, you have the choice to offer your items on an exclusive or non-exclusive basis with Envato. If you choose to offer your items on an exclusive basis, then you’ll benefit from lower author fees, but this means you cannot sell, distribute, or even give away for free your items (or any related items) outside of Envato. This includes on your own website.
But as non-exclusive Author you can sell your own product on another place/your own website.