Hello again, Danielle!
Unfortunately, I am told it would be a significant increase in price because you would have to pay the current price, and not the discounted,
Special Offer price. I have been told that sometimes, by
calling the existing ticket number and explaining your situation, a Cast Member may be able to upgrade your Canadian Resident tickets a little easier, but it does seem to vary from Guest to Guest. I do, however, suggest trying that! Alternatively, it may be a better bargain to
purchase 1-day Disney Water Park Tickets! I’m sorry that I can’t give you an exact price, but I believe that contacting Walt Disney World Resort directly is your best option.
Thanks so much for coming to visit again!
Jen