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The structural difference is a single amino acid substitution at the first position: GHK-Cu uses glycine (Gly-His-Lys:Cu), while AHK-Cu uses alanine (Ala-His-Lys:Cu)

Broad gene-mapping work led by Pickart and colleagues reported modulation of thousands of genes, with roughly a third of human gene patterns shifting toward expression states associated with younger or healthier tissue

Pawlak, R., et al

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This visual cue is one of the most underrated quality-control checks in peptide research and it is a reason to insist on suppliers who explicitly verify copper content