YSL Nu Transgression (156) is a warm coral with a luminous finish that is limited edition and retails for $38.00. In comparison, YSL Illegal Rosy Nude (207) is a warm coral with a satin finish that is permanent and retails for $39.00.
YSL Illegal Rosy Nude (207) is 85% similar — it is more shimmery, more muted, cooler.