If you need a visual chart comparing versions or a deeper technical analysis of the XBLA enhancements, I can provide that as a follow-up.
While a 4K official remake is still just a rumor, you can download and play the game today through these official and community-driven methods: Banjo: Recompiled (Native PC Port) banjo-kazooie remastered download
A: No legal, full-featured remaster is free. The Xbox version requires Game Pass or a one-time purchase (~$15). Free options are either emulation (requires your own ROM) or malware. If you need a visual chart comparing versions
Load a backup file of the Xbox Live Arcade (XBLA) version of the game. banjo-kazooie remastered download
A: Yes, but only via Nintendo Switch Online + Expansion Pack subscription (emulated N64 version, not remastered).