I'm thinking just as bad if not worse. I stung myself with a dead wasp a few years ago and man o man did that little dead dude do a number on me !! And I did it looking at a boat for a friend, opened a hatch and the wasp was on the side of the boat rail and I lay'ed over it to reach down in the hatch n stung myself in the ribs.
As far as the snakes, I would think frezing them would only preserve their venom, but I'm not sure nor am I sure of the flow that would come out with them being dead.