Grant T. yeah if you paste in or import in layout 351 into a project, and then rename those classes before importing a second one, all should work out fine. Be sure to use the Finsweet chrome extension and use the Folders feature to be able to rename Layout 351 quickly.
On the second paste, it will duplicate the interactions but you can rename those manually to match the custom classes you give your layouts.
Also keep in mind this important note: