NYX Leather and Studs is a cool blue with a matte finish that is permanent and retails for $4.50. In comparison, NARS L'Amour, Toujours L'Amour #10 is a cool blue with a matte finish that is discontinued and retails for $25.00.
NARS L'Amour, Toujours L'Amour #10 is 85% similar — it is darker, cooler.