MAC Kelly Yum-Yum is a cool fuchsia with a satin finish that is limited edition and retails for $19.00. In comparison, Guerlain Fluo Stiletto (662) is a cool fuchsia with a natural finish that is discontinued and retails for $37.00.
Guerlain Fluo Stiletto (662) is 95% similar — it is more muted, glossier.