Comparing the two fragrances…

Byblos

Chanel
Cielo
Gardénia
Only in Cielo
Only in Gardénia
Shared character
Both Cielo and Gardénia feature a white floral profile with shared notes of jasmine, gardenia, pepper, sandalwood, musk, nutmeg, patchouli, and coconut, resulting in woody and white floral accords.
How they differ
Cielo is characterized by unique notes of lily of the valley, mandarin orange, and vanille, creating powdery, balsamic, fresh spicy, patchouli, vanilla, and warm spicy accords. In contrast, Gardénia incorporates rose, orange blossom, tuberose, vanilla, aldehyde, vetiver, violet leaves, pineapple, tarragon, green notes, fruity notes, castoreum, carnation, animalic notes, sweet pea, green leaves, leaves, green pepper, fruits, costus, and daffodil, which produce floral, green, fruity, fresh, sweet, creamy, animalic, lactonic, and tuberose accords.
Who each suits
Cielo suits those who prefer powdery, balsamic, and warm spicy profiles. Gardénia suits those who prefer floral, green, fruity, creamy, and animalic profiles.