Reusing master pages is one of the productivity tools that helps you to take advantage of a few minutes of work. Knowing how to import master pages will be very practical when you'll need to create several documents that need to have the same page design.
Create a new document with the same global setting: A5 size and double-sided, and eventually several empty pages.
Go to Page | Import and specify which document you want to import the page from: FarAwayMag seems a good choice.
Then specify which page you want to import. Let's say we want to reuse the cover page, so you write 1 in the Import Page field.
Depending on what you need, you can ask for new pages to be added in your new document. Validate them.
Then go to Edit | Master Pages and click on the third button Import master pages from another document.
Choose the document and then the Master Page.
Click on Import and it will be added to the Master Page list of your new document.