Natural materials are complex systems
A rose absolute, jasmine absolute, vetiver oil, or resin is not one molecule. It is a living profile made of many aromatic components, each contributing texture, diffusion, color, tenacity, and mood.
That complexity creates richness, but it also means no two lots are guaranteed to be identical. Soil, climate, harvest time, extraction method, storage, and supplier handling can change the odor.
Commercial translation: record supplier, lot, extraction, date received, dilution, odor notes, and where the material appears in your formulas.