I am not sure how you got them both. The 1040SR is only if you are 65 or older. It is just a simpler to read form but the taxable amount should be the same. If you itemize then yiun cannot file a 1040SR.
What lines are different?
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**