well, you might, unless someone here has both, you won't know unless you try. i have a 29PFX-A sitting in a box in my garage, I haven't tested it yet, it'll fit into an Egret III cab just fine. You may have to switch the frame around and you may have to take the back piece off (or make a custom one) to fit cause the tubes pretty damn big and from what I remember there's not much space in a Super Neo cab.
you'll def have to get some foam for the bezel, or dremel it out depending on how its mounted.