i don't know what year they changed the brakes out on the banshee. but there are 2 different brake sets. one is the newer style and then there is the older style that looks like this:
if the brakes look like the ones above then no the spindles are not exactly the same. i will post a pic of the 2 to show you the difference. they ARE interchangeable but the brakes can only be used with the correct spindles because they are not interchangeable. like i said i don't know what year they changed but i know there is a difference. here is the pic to prove my point. look at the mounting brackets for the brakes, on the j-arm banshee spindles they are closer. that is the only difference.