Smashbox Mongal is a neutral purple with a matte finish that is limited edition and retails for $22.00. In comparison, Natasha Denona Electric Violet (28V) is a cool purple with a satin finish that is permanent in palette and retails for $29.00.
Natasha Denona Electric Violet (28V) is 80% similar — it is more shimmery, darker, cooler.
