Tip for you

Yes, you can. Do not forget go to ticket counter check out before exit the park. You do not need to re pay the parking fee either (same day). Kept the parking stick over the dash board. Most time you can not change theme park in the same day. Unless you purchased ticket call hopper ticket, which allow you unlimited admission to all Disney Theme Parks.
Tip for discounted ticket: You will found a lot discount ticket offer online or at Orlando area. That is a catch, mostly you need to attend a business seminar (they are selling the time share vacation home)