Comparing the two fragrances…

Dior

Gritti
Blanche
Neroli Extreme
Shared character
Both Blanche and Neroli Extreme belong to the citrus fragrance family and feature shared notes of orange blossom, vanilla, amber, orange, and woods. They both share citrus, fresh, sweet, and powdery accords.
How they differ
Blanche includes notes of bergamot, rosemary, violet, and almond, and is characterized by a woody accord. Neroli Extreme contains musk, vetiver, galbanum, petitgrain, citrus notes, marine notes, and lemon peel, presenting floral, green, fruity, amber, aromatic, musky, and vanilla accords.
Who each suits
Blanche suits those who prefer a profile featuring rosemary, violet, and almond. Neroli Extreme suits those who prefer a profile featuring marine notes, galbanum, and petitgrain.