No, you cannot add a 2017 Form 1098 to your 2018 Tax Return.
However, you can Amend your 2017 Tax Return to include the additional mortgage interest reported on your 2nd Form 1098. You can click here for instructions
on Amending your tax return: How to Change a Tax Return You Already Filed. TurboTax will walk you through
Amending your State Tax as well.
