I would have to say Ingram's marble resembles Oberus' marble more. But yeah same concept.And a better example of the re-use of marble forms is Skyress, Storm Skyress, and Boost Ingram.
I think Skyress and Boost Ingram is reuse of marble form, but Storm Skyress is a bit far away from that.Actually the similarities of Skyress and Storm Skyress are only the horns, the circle at the bottom, and the head.And the previous 2 are needed for a "jumping" Bakugan.And back to topic...the chance of creation of Naga's Gatekeepers real ball is rather low, since they are not shown in the show, and I have no I idea if the Gatekeepers ball form were even designed. Though we know that the original Naga was not in the show but it was released in Bakuswap series, but that may because Naga is the main villain so it got the chance to have a ball form design.