Help: Page changes affecting multiple pages?

This may help, I made this page here: https://www.insuremymedicare.com/medicare-supplement-plans/texas

Then duplicated it here only needing to change minor things like, text that didnt effect the Texas page: https://www.insuremymedicare.com/medicare-supplement-plans/michigan

But now I want to move on to this page without altering the first two finished pages above: https://www.insuremymedicare.com/medicare-supplement-plans/cigna