I'm not sure about the Milani. The L'Oreal HIP Flare (404) duo has an orange similar to Firespot. Similar, but different enough for me to justify buying Firespot yesterday. (I bought one for my mom, too.)
Firespot has a great goldness to it. I like it because i can wear it on the lid and in the crease and it looks from most angles like I'm wearing two colors: orangy gold on the lid and richer orange in the crease (an effect similar to Woodwinked on me -- I'm an NC43).
The HIP orange, if I remember correctly (I'm not with my cosmetics right now) is slightly deeper in the pan. And, while it has great color, it doesn't seem to have quite the punch and versatility of the MAC. Still a great color to have, though. I loved it like crazy until I met Firespot.