MAC Bougie is a warm duochrome with a pearl finish that is permanent and retails for $23.00. In comparison, Natasha Denona Calypso Blue (05M) is a warm duochrome with a sparkle finish that is permanent in palette and retails for $29.00.
Natasha Denona Calypso Blue (05M) is 85% similar — it is more shimmery, warmer.