You can't file another Original 1040, you will need to file an Amended 1040X.
If you had Self-Employment income, you will need to report and pay self-employment tax (your FICA tax)
Yes, you can use different software, but you need to compute an Amended return using a coy of the original. An amended return shows the CHANGES from the original.
Since your return sounds simple, you could compute a "Mock Original 1040" the way you did with 1040NOW, select to print and mail, (but don't) then use that TurboTax account to amend it.
When you amend, only enter the 1099-NEC on your Schedule C, not both Schedule C AND 1040.
AMEND LINK
@Creator35
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