MAC Nude Pink is a warm peach with a semi-matte finish that is limited edition and retails for $35.50. In comparison, Guerlain Perles d'Etoiles is a warm beige with a luminous finish that is limited edition and retails for $60.00.
Guerlain Perles d'Etoiles is 90% similar — it is more shimmery, darker, more muted, warmer.