You can't change the funding source of a completed payment unfortunately.
You could only request the seller to refund and then pay again BUT if you do that offer to pay the sellers fee and have a part refund as the fee element is not returned as part of any refund the seller issues.
Advice is voluntary. Kudos / Solution appreciated.
Request to cancel order and a refund issued with merchant. Then buy it again. Beware, there’s always a chance the transaction won’t go through on PayPal Credit as PayPal Credit reserves the right rescind approval and put the charge on another linked funding source.
