The only difference between the VSJ843R and the VSJ843Q is the exterior shape. The 'Q' models are more squared, and the 'R' models are more round. The letters following the 'Q' and 'R' identify the color.
The parts and motors are identical.
We simply have two different shapes, so customers have two options for shape and color.
The VSJ843Q model has the on/off switch to the right, whereas the on/off switch is at the back of the unit on the VSJ843RS.
VSJ843QS - square, silver
VSJ843QR - square, red
VSJ843RR - round, red
VSJ843RS - round, silver