Yes, they will work perfectly fine, provided you add them as proper Jetways, meaning they are part of a parking spot and linked to it.
If they are added just like Scenery objects, they will be static, and this is also a legitimate method: since the simulator doesn't support double jetways on a gate, if you still want to simulate that *visually*, you can place one proper jetway as a jetway, so it will move, and a secondary one as a scenery object, which will be static.