I think the difference would be that the distances and chokes you use would put fewer pellets into the birds. Turkey hunting, from my perspective, is about tight chokes and putting as many pellets on target as possible.
Of course, I'm coming at it from someone that is against body shooting birds so my perspective is skewed. I would suppose that someone doing that could conceivably shoot a choke that wasn't as tight therefore not putting nearly as many pellets into the body.
I know what I've seen a load of #5's do at 35 yds when a buddy shot one low a couple years ago. We threw away one side of the breast meat and picked pellts out of the other. I can only imagine #2s would be worse. Course I guess one would say that there are fewer of them. Then I would say that they create a bigger wound channel thus overcoming that difference in numbers. And then they could say.....well, you get the idea.
I seriously wasn't trying to stir the pot, I was just curious as to why someone would want to shoot a turkey in the body knowing that it would cause meat loss. Just trying to learn...
I will say, however, that I am against #2's being legal for turkey hunting. For the sole reason that they are much more dangerous in shooting incidints. I'm not trying to make it illegal to body shoot a turkey.