Yes, the 'R' isn't like an updated version of the basic model. It's not like changes to it then went on to the next generation or anything.
The 'R' is a separate model range. You pay more for less. Non-essential items get removed, suspension is harder, and the engine is balanced.
The new 'R' goes further by having some carbon panels (in a very brief nutshell).
You can make any NSX R-like by ripping out stuff, adding hard suspension, and even getting the engine rebuilt and balanced. Nothing impossible there.
You can also go further than an R, by adding big brakes, a supercharger, more aero bits etc etc.
If your fear of staying alive, outweighs the thrill of making the corner, brake.