If the previously paid amount is not included in line 26 "Total Payments" box, then I cannot elect to apply to next year's taxes. I am also concerned the overpayment may not recognized by the IRS and they may process a second debit from my account for the new tax amount.
"where on the amended return do I enter the taxes paid with the initial filed 1041 tax return?"
"where on the amended return do I enter the taxes paid with the initial filed 1041 tax return?"
I think the original payment should be reported on Line 25a, even though it says it is for estimated payments and an amount applied from the prior year. Then you can include Line 25a in your list of differences between the original return and the amended return. And your explanation of that difference is the payment made with the original return. That way the amended 1041 will flow down to the updated refund amount or the updated balance due.