From what I understand, smARTcommand was the first version, and probably the one OEM'd against 2.x1. It went up to version 2.2.
The later ARTcommander was a version 1.0 product, and was the one being sold through until the companies demise.
I'm basing this against some sales literature - I have no practical experience of the app. The literature - so you can make your own decision - states:
Quote
ARTcommander 1.0 Voice Recognition for handheld PCs or upgrade from smARTcommand 2.2, smARTcontact 2.2 or Voice Suite 2.2 - $19.95.