As a Pro Subscriber, you can use Transmogrifier to copy a Page from one Game to another. If you need to duplicate the contents of a Page in a given Game, you can copy it out with Transmogrifier, rename it locally, then copy it back to get a complete duplicate (though there are some interesting implications for that, namely that the unique ids for tokens/text/drawings will not be unique anymore, which only causes problems if you plan to make changes to them with api scripts) There is also an API script called True Page Copy, which makes a duplicate page (or possibly you have to make it and tell it which one to use, can't remember) and then copies all the contents of one page to the other, with the caveat that it cannot copy any graphics that are in the Marketplace.
