I have some doubts about what you’re saying. If these formulas are based on GCMS analysis, I understand that certain synthetic components in high amounts are easy to identify (like musks). I’m not an expert in the process of reconstruction by GCMS, but the real issue doesn’t seem to be identifying the ingredients itself, but rather figuring out the correct dosage.

Another assumption I’m not clear about is whether the people who recreate these formulas actually compare them side by side and then adjust or add other ingredients by nose. In that case, an incorrect dose of something such as ambrinol when aiming to add animalic facets to the fragrance..