There are two ways you can do this. It depends on how much of the page content you want to copy.
1. If you want to copy all or almost all of the content
2. If you want to copy only a small portion of the page content
In this case you can turn the portion you want to copy into a Block. Notice that the elements need to be inside a common parent before you can turn them into a Block.
You can drag the sections that you want to copy into a blank Full Width. And then turn this Full Width element (which contains your sections) into a block by clicking Create Block. You can then be able to give this block a name and then reuse them on any pages that you want.