No, you cannot use those refunds to pay the 2019 tax due. It takes about four months for the IRS to process an amended return. If you are getting a refund they mail you a check. And your 2019 tax due is supposed to be paid by April 15, 2020. Even if you get an extension for 2019, it only gives you an extension to file--estimated 2019 tax due is required to be paid by April 15, 2020.
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