Not sure exactly, I think one of of them is for slightly older devices, possibly the "Smart" one. I think one of the them has support for the now obsolete "Hail" z-wave command that some older devices use.
What is the device you are interested in finding a driver for? If is a 700/800 chip device my new universal driver might work and detect ALL the settings for you. I am working on and will hopefully push out support for button (scene) events today as well.
