This is what i was talking about, It seems here you're saying "If you level it through Magian to 95, You could own the 95 and the 70 version" Which i believe is untrue, as I dont believe you can dual wield Mandaus or Kikoku's, even if they're different levels.and if you increase the level via magian trials they would be different item IDs and you would be able to DW them.
I can't prove it, But i was under the impression this way.