From the spec the only difference I can spot is that the video version has built in error correction. The speed is the same 6Mbytes per second (x40).
Whether this means an interface difference I am not sure as I use CF cards.
Otherwise I suspect it is just marketing to sell one to the still market and the other to the movie market. Why you should need error correction for movie, who knows.
It's a bit like computer memory, your standard machine will take the bog standard stuff or a high end machine take the expensive error correction stuff.
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