Dior 999 Matte (999) is a neutral red with a semi-matte finish that is permanent and retails for $35.00. In comparison, YSL Rouge Unapologetic (151) is a warm red with a luminous finish that is limited edition and retails for $38.00.
YSL Rouge Unapologetic (151) is 90% similar — it is warmer, glossier.