You can copy an existing homepage into another area as long as the original homepage has been published.
Go to the area where you want to create the new homepage, open the page options (three dots in the top-right corner), and select Create a homepage.
Scroll past the blank templates to view existing homepages, then select the homepage you want to copy. You can use Ctrl+F to find it more quickly. Once selected, you can begin editing the duplicated homepage.