No, sorry, you may only use one ruler in your device, total.
Manufactured items are never exactly alike.
But the hoop platforms have been built as much alike as possible. To the best of my knowledge there is no significant difference between the platforms. Of course, like all engineers before you and after you who design parts that must fit together, you must design your device to accommodate any manufacturing tolerances. Because of practical constraints it will not be possible for you to select a particular hoop table during the design demonstration. We will be using the older 38mm balls.