Anyway, TVC, i appreciate your answer and i agree on some parts. And thanks for being more informative. But my point was that, imo, Nights would be a better version assuming the same effort that they put on Saturn would be put on the N64, using the extra knowledge and tools that a 18 months of life on the market allows (See Banjo Kazooie, not Tooie). Or, if you prefer, the same percent of hardware that the game uses on the Saturn would be used on N64. There would be some drawbacks, like the sound since the Saturn has a better audio hardware. And maybe the difference wouldn't be "majestic" but i believe it would be at least noticeable. Just my opinion, taking references from other N64 platform games.
Mario 64 is not a showcase of the system, it was the best thing they could do using a 8MB cart and a very early knowledge of the hardware. Heck, Pilotwings was a better showcase imo compared to the other launch titles. Still, even so, i don't think that the Saturn had a good enough 3D hardware to pull off something like Mario 64, even with its low res textures and poly counts.
The N64 had just as many problems as the Saturn in developing games for it. Saturn had those 2 processors and the overly complex hardware and the N64 had the carts and a memory limitation that didn't allow for decent resolution textures. As early as 1997, bigger carts were introduced and some companies like RARE fixed the texture issues but overall, only a handful of companies used the N64 well. The same thing that happened with the Saturn i believe.
Sorry if my post is hard to read, my English are not perfect.