I've heard both yes and no.
Trebor would know for sure. Write to him if he doesn't post.
I'm curious as to how many different motors have been used in the various Aerus Electrolux upright models since the Discovery II. All but a couple early 2000s machines have used exactly the same outer case in different colors. I have noticed less suction in the Discovery II and ProLux than in the Epic 3500SR, more still in the Lux 4000 whose outer motor housing below the bag compartment was larger, and a lot more in the new Guardian, which has the same smaller lower housing as the Epic/Discovery.