Comparing the two fragrances…

G Parfums

Labsolue
Alpha
Alpha 1977
Shared character
Both Alpha and Alpha 1977 feature musk and share powdery, amber, animalic, and musky accords.
How they differ
Alpha contains a wide array of notes including rose, mint, sandalwood, vanilla, amber, leather, freesia, patchouli, saffron, tonka bean, woody notes, birch, violet, civet, castoreum, cedar, nausea, ambroxan, peru balsam, quintozar, agarwood (oud), and olibanum, resulting in woody, leather, smoky, and oud accords. Alpha 1977 is characterized by ambergris, labdanum, aldehydes, and ambrette, which produce floral, aldehydic, fresh, and balsamic accords.
Who each suits
Alpha may suit those who prefer complex profiles involving leather, smoke, and oud. Alpha 1977 may suit those who prefer fresh, floral, and aldehydic compositions.