Not an expert but found it.
The differences are simply a matter of the amount or concentration of oils in the fragrance. The highest concentration is in pure perfume (or parfum). Next would be Eau de Parfum, then Eau de Toilette, and finally Eau de Cologne. Some manufacturers make a solid perfume, solid perfume is as strong as a pure perfume however it is in a gel-like consistency.
Eau De Toilette and Eau De Cologne are generally interchangeable, especially in Men's fragrances. After Shave has the least amount of oils. The higher the concentration the longer your fragrance will last, and the less you need to apply.
At another place. It says
Eau de Parfum and Eau de Toilette carry different strengths of perfume. Eau de Parfum typically contains 15% aromatic compounds, while Eau de Toilette contains 10%. If you are looking for temporary yet cost effective product, then Eau de Toilette is a better choice. But if you are product with longer lasting scent, Eau de Parfum might be a better choice.
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