MAC Can't Stop, Won't Stop is a warm plum with a sparkle finish that is limited edition and retails for $18.00. In comparison, Natasha Denona Maroon (22M) is a warm plum with a frost finish that is permanent in palette and retails for $29.00.
Natasha Denona Maroon (22M) is 90% similar — it is less shimmery, darker, cooler.
