Natasha Denona Shine (218M) is a warm copper with a metallic finish that is permanent in palette and retails for $29.00. In comparison, Natasha Denona Spontaneous (450M) is a warm orange with a metallic finish that is permanent in palette and retails for $29.00.
Natasha Denona Spontaneous (450M) is 80% similar — it is darker, warmer.