Upgrade EA Sports FC 26 ULTIMATE edition (from standard edition)

Hi everyone, 

I bought the standard edition of EA Sports FC 26 around 1 month ago in sales with ea access. 

After almost one month I would like do the upgrade with the ultimate edition. It is possible?

I can't ask a refund for my standard edition (I bought it almost 1 month ago). 

I'm trying to understand if there is a method to pay only the difference of price between the standard and ultimate edition...
Thanks!