Is the Xbox version of Conker the same as the N64 version?
It is the same game, story-wise, but the XBOX version has more censoring than the N64 one. Which is kinda sad being that Conkers is supposed to be a more "comically mature" game.
But, the XBOX version is prettier...
IMO if you never played it before, or don't remember playing it, I'd go with the N64 version. Its still a great looking game.
That reminds me, on the topic of games that pushed the technical limits of the N64, Conkers was definitely one of the few games on N64 that pushed it's limits. They were the first on the console to have dynamic shadowing, and proper facial animation.
Here's the wiki link.
After the release of Conker's Bad Fur Day, many publications and websites declared the graphics were the best to date on the N64 (even better than Perfect Dark).[3][4] The title included a number of technical effects that gamers were not yet used to seeing. The engine featured dynamic shadowing, colored lighting, and other visual effects, still fairly rare at the time; large areas with a long draw distance and no distance fog, a rarity among Nintendo 64 games; detailed facial animations, including lip syncing, at a time when the vast majority of characters in 3D games had static or minimally animated faces and individually rendered fingers on some characters, rather than the standard "brick."
It's amazing how much Rare pushed the technical boundaries of nintendo consoles -- great, great developers.