If you are talking similar in theming the closest would be Expedition Everest, though obviously EE much wilder for a 9 year old.
If you are talking similar in 'feel' I would say Space Mountain, just the fact that the track construction and physics are of similar design. We are talking about 2 roller coasters where punch cards were used to calculate the track curvature since computer CAD programs were not yet available! and if you are talking what will feel most similar to your back, well honorable mention goes again to Space.