Not just the electrical fitting are different - The SV03 can only power the 996083-01 (35w) /102882-01 version of the direct drive head but not the 50w (996083-03 /102882) version. You need the SV05 in order to do that. I believe the SV03 motor units belong to all the V6 Models up to the Total Clean - hence why the Total Clean only comes with the 35W direct drive motor brush head. BTW if you put the SV03 on max setting the 35W motorhead stops.