The slider has, as you said an extended chassis and a different body, but it has 2.4 GHz DSM. It also has oil shocks, the same motor and ESC as the Mini-Baja(seperate from the receiver), different wheels tires and takes a different battery configuration. The Mini-Baja also has seperate ESC and Receiver. This is a really good list, it should help a lot of people.

Pontiac K