The difference between Armani's 2020 Acqua di Giò flanker Profondo and the new-to-2021 Profondo Lights is subtle indeed. In a crowded Sephora, many will likely not spot much to compare at all. To own both, you'll have to either be a collector of oceanics or have a vested interest in the brand. If you're willing to take your time with them, there are riches to be found in both that will rewa...