This is the European release of Chip 'n Dale Rescue Rangers 2 for the NES. While not an official sequel to the first game, it shares a similar style of gameplay.  Regional differences would likely involve localization for text and possibly slight variations in the game's content.  The developer and publisher are not officially confirmed for this unofficial release, its origin being the ROM hacking community.

Chip 'n Dale Rescue Rangers 2 (Europe)

Chip 'n Dale Rescue Rangers (Europe)