https://github.com/german77/JoyconDriver/blob/master/switch2/command_handler.lua

ColorA = 0x013019, -- 0x3 bytes RGB
ColorB = 0x01301c, -- 0x3 bytes RGB
ColorC = 0x01301f, -- 0x3 bytes RGB
ColorD = 0x013022, -- 0x3 bytes RGB

Pro Controller 2 colors

Color A: 0x232323
Color B: 0xA0A0A0
Color C: 0xE6E6E6
Color D: 0x323232