The main difference between "1 Million Eau De Toilette" and "1 Million Parfum" is their fragrance oil concentration. Eau De Toilette typically contains a lower oil concentration than Parfum, resulting in a lighter and more subtle scent. On the other hand, Parfum offers a more intense and long-lasting fragrance experience with a higher concentration of oils. Both "1 Million" versions share the same iconic scent profile, but Parfum delivers a more decadent and luxurious olfactory experience.