Natasha Denona Illusion (423DC) is a cool duochrome with a pearl finish that is limited edition and retails for $29.00. In comparison, Pat McGrath Astral Lilac Aura is a cool lavender with a sparkle finish that is permanent in palette and retails for $25.00.
Pat McGrath Astral Lilac Aura is 80% similar — it is more shimmery, darker, warmer.