Hi, Jessica!
Great question! Thanks so much for sending it to us here at the Disney Parks Moms Panel!
When you purchase your Park tickets online using your
My Disney Experience login information, the tickets will link to your account once you complete the purchase. The cards you received are a back-up for just in case you run into any problems when using
MyMagic+ touchpoints throughout the Parks and Resorts.
While you don't need to link those since they are already linked to your account, I would bring them with you just so you've got a backup should you need them for any reason.
I sure hope this helps, Jessica! Please don't hesitate to write back in if we can help with any other questions you have.
Wishing you and your family a Pixie Dusted vacation!
~Jackie