I think Nikon still makes a shot gun scope just not the turkey one. The only difference would probably be the reticle. I looked at one this past winter and it had a lot of eye relief. I ended up getting a Nikon buck master for my savage 220 slug gun it doesn't have as much eye relief but it is pretty descent also.That was at a Scheels store if you have those in your area.
The biggest difference is actually the eye relief. The turkey pro has 5" of sustained eye relief which I would argue should be the industry standard for a shotgun scope. Most of the scopes mentioned in this thread only have 3.5-4" and most of the guys shooting these scopes will get scope burned by them if they shoot even a modest number of turkeys each season with those scopes. Inevitably you're going to have to shoot at one from a twisted, contorted position that offers little to no recoil management and that's when the scope introduces itself to the face.
I have a brand new turkey pro sitting in a box awaiting attachment to my browning silver. The truth is I just haven't had much reason to take off the Pentax light seeker currently attached to it since I use the gun so infrequently.