Free dining tickets question for FL residents

[Bloomingbeauti]

I am hoping to book free dining if it's available the last weekend of Sept for 4 nights at Caribbean beach. When I add on the mandatory 2 day hoppers they total $1386 ( just the tix) . The deal is though we are Florida residents and we can get four day hoppers for $1350 for the 5 of us .My question is can I still upgrade my tickets once I get there to the Florida resident 4 day hoppers even though they are less expensive? I am not expecting a refund of the $36 I just want to add on the extra days which should hopefully be an no additional cost.