In response to the first question, I have a few thoughts. Central nervous system activity is very common in dead turkeys. They may appear to be "alive" but given close range shots, with quality amunition and a full choke, I doubt it. That being said, do not take the shot for granted. Get on your feet and follow up on him right away. be ready to shoot again if he picks his head up. Once on him, look to see if his head is bloody and dragging on the ground. If so, let him be. Touching a bird in this state may often stimulate more flopping. But if he looks like he has control of his head, or his eyes are looking at you, put your boot on his neck and control his legs. from there you can lift his body off the ground while holding his head into the dirt. It shouldn't take long.
In response to the second question, deer and turkey are very different. The decisions you make after wounding a deer are baised off of a very different set of rules. If you have clearly wounded a turkey and he has managed to get away from you, you are going to have a bad day. I would seek as much help as you can summon as quickly as you can. get as dog if possible (and legal) and be ready to take a snap shot as he comes out of whatever brush pile he has hidden in.
Good luck, and keep you cheek on the stock!