Supposedly a reason the trains were changed was to reduce the swinging strain, the new trains were designed to swing less forcefully. Whether this means they swing as 'far', probably not. It's more to do with the old trains swinging quicker side to side, and the new trains have a more damped swing. (I guess old trains had more weight being thrown around at once with the 2 rows coupled together too)
Definitely some difference between the trains and how they swing, but I don't think it would have made that noticeable a difference to the ride experience. I imagine anything it lost in the more noticeable swing it makes up for in the floorless effect anyway.