Hi Beth!
I believe the steps are different because the beginner/intermediate workouts were designed to be included with the purchase of the retail version of the High Step and The Step Home Step. The smaller step can be purchased at Walmart for under $25.00 right now with Cathe's VHS CTX All Step currently. In the future, the Basic Step/Body Fusion DVD will be included. The retail version will use the smaller Home Step in both workouts.
If you are looking to purchase a new step, I highly recommend the larger Club Step (the one in our Basic Step workout). It is the most used piece of equipment that I own. It can be used as a weight bench, step bench, and the risers are interchangeable with the High Step too!
HTH!
~kandy~[/img]http://www.click-smilies.de/sammlung0304/sport/sport-smiley-003.gif[/img]