Upgrade to Z-stick version 2?

I have the Vera 1 with a z-stick dongle. The z-stick dongle is model zsfs100-us. Is zsfs100-us the same as z-stick version 1, or is it z-stick version 2? The firmware on it appears to be 2.78.

Assuming I have z-stick version 1, what about version 2 is different? Would version 2 work with Vera 1?