Not saying all are trade blades but certainly there was trade between these areas. Note that for example Magindanao pieces do also have woven silver bands like the Sulu.
I also wonder if this could be a type of cross over of which Cato is not aware.
We certainly need more information than Cato provides. Wish Cecil would come out with his book...
I will say that the okir work on the blade and on the silver work does not appear to be Maguinanao or Maranao.