1. If you’re a GenerateBlocks Pro user then you can edit a page, Copy All Content from the 3 dot menu. Then create a new GB Local Template, paste in the copied content and save. Then you can simply add the Local Template to any page you require.
2. Without GB Pro you can do the same thing, but simply copy all and paste it to the new page.
A note of caution on using the plugin, there are some potential risks with the Gutenberg editor that unique IDs don’t get refereshed on duplication, so its best to do a trial run and check to make sure that any changes you make are displayed correctly. You should also only use the New Draft option ( Not Clone Page ) as that has been known to cause database issues in the past,