Between what two?..Mine are both the same thing and if they make any different ones other than these,than im not sure which one you have and which one I have...If that makes any sense?
I am not sure if you are needing the controller to be specifically a SMC unit but if not you may look into a progressive Devilsown unit. You can buy just the controller new for $155. I had one on my car a few years ago and went mid 10's with one with no issue. Its very small and easy to adjust. I am not trying to sell thier stuff I just thought it might be an alternative for you.