Yes — creativehub is designed to be your single home for both ordering prints of your own work and creating and selling print products. When you sign in, you land on an options page where you can choose to order prints or set up your art store, so you don't need separate sets of credentials for the two activities.
Whatever you upload to your files is available across both — the same artwork you order a print of can also be turned into a product to sell, which saves re-uploading.
If you arrived through a newer, separate ordering or selling app rather than the classic creativehub dashboard, the sign-in experience may look a little different. If you're ever unsure which login to use, sign in with the email address you originally registered with, and reach out to the team if anything doesn't line up.