MAC I've Got a Crush on You is a neutral duochrome with a metallic finish that is limited edition and retails for $32.50. In comparison, Natasha Denona Orion (105DC) is a neutral duochrome with a metallic finish that is permanent in palette and retails for $29.00.
Natasha Denona Orion (105DC) is 90% similar — it is warmer.