Ah nice one ... so you are saying the boxes are the same fitting for the 1200 and 1260 .. therefor I wouldn’t need to buy new boxes unless I wanted the latest cosmetic design.
Assuming you mean 1200 DVT, then yes they are the same. The pre-DVT panniers are not the same in style or fitting as the DVT ones. The inner bags from the earlier pre-DVT panniers will fit in the later panniers. A number of owners (including me) have simply kept the bags from their earlier bikes and used in the later panniers.