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Unfortunately you cannot clone programs across workspaces, but you can share assets across workspaces. So you'll have to build the programs, but keep in mind if you want to use any of your standard templates in your North America workspace you'll want to share those with your AU workspace so that you can leverage those templates in your new program for AU.
Here's the resource document for this. http://docs.marketo.com/display/public/DOCS/Understanding+Workspaces+and+Lead+Partitions