Are the QS4 and QS8 brackets the same? Im thinking of ordering QS8 for my sides and moving my QS4s to the rear. If the brackets are off by a very small amount.that could be well too close holes problems with the drywall and cause some extra work on my part. If the connect points are an inch plus. I dont see a problem

Fronts/Wides:M22s in/on
Center:VP150/VP100 in/on
Hghts,SS,SR:QS8s
Sub:EP500
AVR:Onkyo 3008