Sleek MakeUP Acid #9 is a warm fuchsia with a matte finish that is permanent in palette and retails for $9.99. In comparison, Make Up For Ever S852 Neon Pink is a cool fuchsia with a satin finish that is discontinued and retails for $21.00.
Make Up For Ever S852 Neon Pink is 95% similar — it is more pigmented, cooler.