The short answer is yes!
Since both Elements and Market are part of the Envato network, authors are permitted to upload the same items currently sold exclusively on Market, to Elements, without needing to change their exclusivity status.
This means you can continue to earn the same exclusive rates you always have on your Market sales, while at the same time reaching a whole new customer base by offering the same content on Elements.
Not only is it permitted, we actually encourage authors who also offer items on Market to upload the same content to Elements (assuming it meets our quality expectations & is a good fit).
Note:
Content on Envato Elements is not required to be exclusive and you are permitted to sell the same items elsewhere.