Amended 2020 return shows a refund of $2511. The original return was an amount due of $3674. What happens when IRS processes the amended return?

I am basically asking if the "refund" showing on the amended return will be sent to us, or if it will just reduce the original tax due.  Original amount due is currently set up on a repayment plan, so I am wondering if they will just reduce the 3674 as opposed to actually sending us a check?