ColourPop Frick 'n' Frack is a warm plum with a satin finish that is permanent and retails for $7.00. In comparison, Charlotte Tilbury So 90s (was Birkin Brown) is a warm brown with a matte finish that is permanent and retails for $37.00.
Charlotte Tilbury So 90s (was Birkin Brown) is 80% similar — it is darker, warmer, less glossy.