Page Swap/ Replace

As someone who runs effectively 3 of the same store but for different markets, a way that pages could just be replaced would be great. I normally import my page from my main store to the side stores and have ether replace sections manually or unpublish and republish my page which removes it from menus and I worry affects SEO. I know I could change the template in Shopify but this has sometimes changed my slug which isn’t ideal. Or if there is a better way to do this already please let me know!

PS a way to mirror my stores/ certain page would remove this altogether and save me SO much time!