If the K-1 is for 2019, and it affects the tax filing(s), then that's why you would amend something. You don't "redo" the same form already submitted; the 1040 is Amended by using 1040X to show what is changed.

Read this article:

https://proconnect.intuit.com/community/individual/help/generating-form-1040x-amended-u-s-individual...