Actually it works the exact same way. You just put them in a different place. Motion templates for FCP X go in the following location of each system:
~/Movies/Motion Templates
Now if you are making titles, they will need to go in the Titles folder. If making Generators, use the Generators folder...etc.
If you don't see any of those folders inside your Movies folder, then it means that you haven't made any templates on that machine and you need to create the folders.
The easiest way to handle your scenario is to pick one machine to build your gfx on. Use the Motion splash screen to choose the title template. Build the gfx and save. Motion will automatically publish the project in the correct place for that machine. Continue making all your graphics. When finished, copy the contents of the entire Motion Templates folder to each of the other system's Movies folder. Everything should be in it's proper place including themes and such.
Andy
http://www.timesavertutorials.com