You don't actually need to export it - but when you try to to import it on the new box, you will need to say '-f' (for force).
The only thing is that doesn't work, when I use zpool list it doesn't find any available pools, and using the name given to the pool also refuses to work. I can't think of any reason this should be, but such as the case. I was hoping that performing a proper export would solve my problem.