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Switch 2 uses emulation to run switch 1 games. My guess is that the switch2 version is just nicer textures and a little make more fps line.
(Like that thing those evil evil hackers have been doing since 2017)
Source: https://www.nintendo.com/us/gaming-systems/switch-2/transfer-guide/compatible-games/?srsltid=AfmBOorT9IJEJ6YQ9t3LFG1lBAlfCg9Qq1_infQKrq2ieE-QBLKUssl0