AFAIK this is also in part because there is a difference between "perfume", "cologne", "eau de cologne", "eau de perfume"--some of these are probably the same,

AFAIK this is also in part because there is a difference between "perfume", "cologne", "eau de cologne", "eau de perfume"--some of these are probably the same, I forget the exact details. Someone once explained me there's three different types of smell-good liquids, and they mainly differ in how long they last. Often you have the same fragrance at various prices.