It's up to you to compare your revised and now correct 1040 tax return and your originally filed incorrect 1040 tax return,
and then confirm that Form 1040-X is correctly reporting the difference between the two.
TurboTax has no "comparison" function to assist with this.
The PDF-fillable Form 1040-X and its instructions are available on the IRS website under "Forms".
When filing, do not attach your old 1040 nor your revised 1040 because the Form 1040-X reflects any changes there and becomes your new tax return.
