ColourPop IRL is a warm duochrome with a sparkle finish that is limited edition and retails for $6.00. In comparison, Natasha Denona Burnt Terracotta/Green (1) is a warm duochrome with a metallic finish that is permanent and retails for $28.00.
Natasha Denona Burnt Terracotta/Green (1) is 85% similar — it is more shimmery, darker, warmer.