CoNH35SO4Br and CoNH35BrSO4 are ionization isomers to each other. Which of the following methods are suitable to distinguish these isomers?

With AgNO3, first complex gives AgBr recipitate but the second does not. Similarly  with BaCl2, second complex gives BaSO4 precipitate but the first does not. Electrical conductivity of second complex is more than the first. Solid state magnetic moment is same for these two isomers.