Yeh, they pretty much mean the same thing. T.s.parietalis ranges over a fairly large area of central and northern US up into several areas in Canada. A Manitoba Redsided is just a T.s.parietalis from that region of Canada...at one time most redsideds came from there. There are large snake dens in the province where tons of snakes used to be collected for the pet trade (actually it's the largest gathering of snakes in the world
), they've since outlawed commercial collection of snakes from those areas....but I'm sure there are some still floating around out there and there could be Manitoba bloodlines being bred as well.