Can these rails be joined seamlessly with a normal 55" Festool Rail (the one without the 32mm holes)?

Yes, all Festool guide rails can be joined together without any issues.If you plan to join multiple LR32-style guide rails for the purposes of shelf pins or other 32mm offset tasks, you will need a special connector to ensure the spacing is correct between the rails.If you are joining them for any other task, the standard guide rail connectors can be used.http://www.festoolproducts.com/festool-496938-longitudinal-stop-la-lr-32-fs-2-pack.html