Hi BT, thanks for your question. Those are actually the same lawn mowers. The LM2001 refers to the mower kit and the LM2000 refers to the mower itself. This is also true for all of the other tools. The blower model number LB4801 refers to the blower kit (battery and charger included) while the LB4800 refers to the blower itself. We hope this helps clear up any confusion. We do not have any newer/updated versions of any of our tools at this time.