W231 and BE-86 are very close in FPS and accuracy in my 686 6" revolver.
I would almost say it is the same powder, since they are so close in FPS and accuracy.
I can't find my w231 picture but this one of BE-86 with the 6" barrel off of sand bags on one of my chrony test, gives you an idea if this powder works in a .357 case.