You have a Demon and Proform baseplate on hand now, no?
If one were curious enough, and had some time to kill....... they could do a little side-by-side look see.
The proform works, and is on my car. The demon is waiting for parts and is only a base plate and center section right now.
When i get a minute, I will pull the base/Throttle plate back off of the Demon and take a real good look at it.
more than likely the only way the two will be look at together is if i buy another proform base plate for the Demon. Which may happen down the road.