Sleek MakeUP Acid #4 is a warm orange with a matte finish that is permanent in palette and retails for $9.99. In comparison, ColourPop Sunkiss'd is a warm orange with a semi-matte finish that is permanent in palette and retails for $4.50.
ColourPop Sunkiss'd is 90% similar — it is more shimmery, more muted.