08-17-2014, 02:42 PM
I don't know how well you can see it but one has a small notch cut out in the base of the cone and the other doesn't. I always thought the notch would have been an indicator because it is positioned at the top of the knob when they are in the off/low volume position. Springs and spring hole are identical.
It looks like one is larger in the photo but they are identical in size.