I've seen photos of both, and noted the difference in the shape of the handles. Are they also different internally? As in, do they rotate and tilt a different amount, use different pots etc?
I think they are the same as far as x/y movement (leftright/updown)
but one thing I did notice or couldn't tell clearly is whether stunn runner had the "photon torpedo" buttons (thumb "triggers")
But I don't have any reall evidence to back up whether the internal pot specs or gear ratios are exactly the same or not, it's just assumed by most people (i.e. why would atari make it more expensive to produce the same controller for different games and make it look the same...)
*shrug* YMMV
Rampy
PS also - games with funky controllers like this would be more popular with operators if they had conversion games available which also leads me to believe they kept the same exact joystick desgin and just didn;t put x-wing cockpit decals on it =P