Players who boot up Splatoon 3 with some Splatoon 2 save data on-board their Switch will get a neat set of bonuses.
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Bonus for having Splatoon 2 save data : r/splatoon
The Splatoon 2 to Splatoon 3 save data transfer process is super simple
Splatoon 3 amiibo rewards and compatibility
Splatoon 3 offers bonuses for Splatoon 2 save data
Secrets and Unlockables - Splatoon 3 Guide - IGN
Splatoon 3, Video Game Fanon Wiki
Splatoon 3 lets you transfer your save data from Splatoon 2
Splatoon 3: How to Import Splatoon 2 Save Data and What It Does