Mixing and matching properly sized components from different Mfg' shouldn't be an issue, The key is properly sized components. I have even swapped one MFG caliper on to a different MFG brackets without any issues. The master cylinder dia needs to be sized correctly for teh amount of piston area being installed. You may get lucky with the one you have but more than likely you will need a new (different size) one. Drum brakes require more fluid volume than a disk system.