Hi Amy!
Both
Disney's Pop Century Resort and
Disney's Art of Animation Resort are great options from the Disney Resort Collection. Generally, hotel reservations can be modified, subject to availability, and you will be responsible for paying any additional cost associated with the hotel change.
Depending on the type of reservation you have, you may be able to change your hotel online by visiting
My Disney Experience. Navigate to your reservation at Disney's Pop Century Resort and if there is a "Change Reservation" button next to your hotel reservation, you will be able to search for availability at Disney's Art of Animation Resort as an option to change your existing reservation. If there is no "Change Reservation" option for your hotel reservation, then you will need to
call Disney Resort Hotel Reservations for assistance.
It looks like your trip is just a few weeks away, so you will be able to join in the festivities of the
Walt Disney World Resort 50th Anniversary Celebration during your visit. Be sure to look for special anniversary merchandise, tasty treats, and beautiful decorations to enjoy. And come back to see us if you have any additional questions as you count down the final days until your vacation! T-T-F-N, ta ta for now!
~Crystal