Deductions & credits

I read on the 1040-X instruction as well as other posts in the forum, and saw this.

 

Resident and nonresident aliens. Use Form 1040-X to
amend Form 1040NR or Form 1040NR-EZ. Also, use Form
1040-X if you should have filed Form 1040 (or, for years before
2018, Form 1040, 1040A, or 1040EZ) instead of Form 1040NR
or 1040NR-EZ, or vice versa.
To amend Form 1040NR or 1040NR-EZ, or to file the correct
return, do the following:
• Enter your name, current address, and social security number
(SSN) or individual taxpayer identification number (ITIN) on the
front of Form 1040-X.
• Don’t enter any other information on page 1. Also, don’t
complete Parts I or II on page 2 of Form 1040-X.
• Enter in Part III the reason why you are filing Form 1040-X.
• Complete a new or corrected return (Form 1040, 1040-SR for
amended 2019 and later returns, Form 1040NR, etc.).
• Across the top of the new or corrected return, write
“Amended.”
• Attach the new or corrected return to the back of Form
1040-X.
For more information, see Pub. 519, U.S. Tax Guide for
Aliens.

 

From page 8 of 1040-X instruction. Am I understanding it correctly that we use 1040-X (only Part III) and fill out a new 1040-NR if we mistakenly used form 1040? Thanks!