I have a 1099-INT form with interest in box 1 to report, but I also have a 1098-SUBSTITUTE form with a box 1 from the same mortgage company, which one do I put for my interest paid

No, please do not add these amounts together.

Form 1099-INT reports interest received by you, such as interest on a savings or checking account.

Form 1098 reports mortgage interest paid by you.

Mortgage companies and other lenders are allowed to issue their own 1098-SUBSTITUTE forms, so long as the form contains all the required information that would appear on the IRS-approved Form 1098.