ColourPop Gumball is a warm pink with a frost finish that is limited edition and retails for $6.00. In comparison, MAC A Medley of Mauves #1 is a cool pink with a metallic finish that is permanent in palette and retails for $21.00.
MAC A Medley of Mauves #1 is 85% similar — it is more shimmery, lighter, cooler.