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I think that the terminology Draconian Magick has been used mainly by Karlsson because Dragon Rouge is associated with the symbol of the dragon. As it is written on their web-site "Typhon represents the Red Dragon and the eternal primeval force and matter from which all originates". So, I think it's just a matter of semantics.
Ophidian derives from the Greek word Ophis, which literally means snake. I'm unaware of any tradition claiming to be ophidian but it sounds as it's the same concept as the Draconian one.
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