Selling on Elements is easy regardless of your current exclusivity arrangement with Envato. If you are Exclusive to Envato Market not only is it permitted to sell on Elements, we actually encourage it!
For more information, refer to As an exclusive Market author, can I upload the same items to Elements? article.
Non-Exclusive to Envato Market
Content on Envato Elements is not required to be exclusive and can be sold on Envato Market or elsewhere.