Your View Cart code is unique to you but the same for all your products and pages. You only need one block of View Cart code on every page that has any number of Add to Cart buttons.
To be safe, you should always copy your View Cart code directly from your Seller Admin and then paste-paste-paste into each page that requires it.
Simply copying the View Cart button from one page to paste into another may not actually copy the complete View Cart code, as there's a whole chunk of that code which is not part of the clickable button link itself, but which is required for proper generation of the nice cart overlay in each page.