As the final state of the 3DS version, it contains a unique hybrid of content: : Primarily equivalent to PC Version 1.2.1 .
: Includes some features from PC versions 1.2.2 through 1.3.1, such as the Frost Moon event and Beetle Armor .
: The "New" Nintendo 3DS models (and 2DS XL) support an Expanded World feature (4200x1100) and higher frame rates not available on original 3DS models. 3DS version history - Terraria Wiki
This update focused on "high impact" issues to stabilize the gameplay experience: