They are not the same scopes. Both scopes are their entry level models made to compete with the lower priced scopes in the market. The VX-I is just a little better in all regards than the rifleman. Better lenses & coatings and a bit better adjustment system. If you could afford it, I would recommend the VX-II, they are worth the extra money. The rifleman & VX-I do not have click adjustments, they are just friction type, and the quality of everything on the VX-II is worth it.
Honestly, I'd seriously look at other makes of scopes for the same price before buying the VXI & rifleman scopes. For example, the burris fullfield II 3-9x40mm is a suprior scope than both the rifleman and VX-I at less price.