ColourPop Feather is a neutral gray with a pearl finish that is limited edition and retails for $6.00. In comparison, NARS L'Amour, Toujours L'Amour #9 is a cool gray with a pearl finish that is discontinued and retails for $25.00.
NARS L'Amour, Toujours L'Amour #9 is 85% similar — it is lighter, cooler.