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@EdwardZ
Actually NJS does not mean that they are identical. There are all kinds of possibilites for tuning and tweaking. The differences are not significant but they are measurable in the lab.
It also does not mean that they are of the same quality. Sugino's 75 track chainrings has the same NJS certification as their Super Zens. One can surely hand-select a Dura-Ace or Sugino 75 chainring to be round enough but even the worst of the production run are NJS. Some NJS products have industrial cartridge bearings and some have cup-and-cone. There are differences. The industrial bearings used might be of a high quality but they are inferior to cup-and-cone in the application. Their only benefit is the ease of their replacement.
All that NJS says is that a product has been certified by the NJS.