The one on the right looks like a coke keg - the couple I've seen were shorter and wider like the one in the pic - looks a lot like the one I had in the spring. The top view as well looks like a pin sticking out of the post on the bottom - pointing up - I think its a pin lock... would need to ask to make sure though...
I wonder if the CO2 tank is hyrdro'd... must be a 20lbs'er? I wonder what "taps and hoses" are included...