Read and re-read the fine print
Read and re-read the fine print. If both of them say that the "original UPC" is required, then you're out of luck. You'd be better off sending the original UPC for the higher rebate. That way, you'd save more.
Or you could call Apple and confirm if you could send a photocopy of the UPC for the lesser rebate - note that this is not a guarantee in any way that the rebate will be processed. Almost all companies outsource rebate processing to other companies and the only commandment that the rebate processing entities live by is "if the submission seems to deviate even a little bit from the rules, chuck it in the trash". But if you have the patience to argue and push on, then you could actually get the rebate.
Good luck! 🙂