Your Switch 1 controllers will work on Switch 2, including on Switch 2 exclusive games

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If you already have a Switch 1 Pro controller, you can use it on your Switch 2, even in games exclusive to Switch 2, according to Nintendo:

https://www.nintendolife.com/news/2025/04/nintendo-confirms-switch-controllers-are-compatible-with-switch-2-exclusive-games

They note that there are exceptions if the game requires the use of Switch 2 exclusive controller features such as mouse controls, but otherwise, no need to buy a new Pro controller if you already have one.