I smell a similarity, although I'm only going by a sample of Orange Spice. Must get a full bottle of this...:-)
I wear Kouros more often but there are times when Orange Spice would be a better fit, particularly under more formal circumstances. Kouros can be a beast to me, while Orange Spice can feel like Kouros after some etiquette lessons, a new wardrobe and a small fortune inherited from a distant relative.
They're both great and somewhat alike to my Neanderthal nose (pluran is right that Kouros is more fougere while OS is more oriental), but I think Kouros is different enough not to be a mere carbon copy.