I accidentally used the "Self-Employed" turbo tax version. I only need "Premier". Is there a cost difference? Is there a way to change to Premier without reentering data?

Premier costs $54.99 and Self Employed costs $89.99, so there is a bit of a difference between the two. Unfortunately, there is no way to change which version you are using without using the clear and start over function. So you will have to reenter everything if you want to change versions.