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First propylenglycol CH3CHOHCH2OH and glycerine HOCH2-CHOH-CH2OH are not the same substances. So you cannot compare them even they have similar behaviour.
From the puritiy it depends is it made for medicine, drug, etc. or technical application. You have to know which byproducts inside. But I would never use a technical product to use it for food or for using at humans or animals. In the opposit it depends which application you need. (Analysis, synthesis, etc.)
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