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Patch to change character with L or R

They would tell me some patch to make that in the overworld with touching L or R the character is changed between mario or luigi but it works as a 1-player game
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Possibly launching a hack in about 2 months ≧ ◉ᴥ◉ ≦.
The closest patch I found for switching characters is this

If you just want singleplayer there's also this patch