There are a few different variations out there. The old "Dead Coyote" choke was a 0.660", then they made it available in 0.680". Now I believe it has wad strippers and is 0.680" (unless someone else knows otherwise).
So yeah, by and large, a choke is a choke. The length of the restriction, porting, and constriction diameter is what matters. I wouldn't expect a 0.680" turkey choke to perform any differently than a 0.680" coyote choke.