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Gosh it looks like trying to ID a water lily is as hard as trying to ID a daylily or iris. I'll probably never be sure. From looking at the pictures on your link I'd say the Lemon Chiffon is the closest only because it has the speckled leaves.
I've had terrible luck this year with plants not being what their supposed to be! ~ And they haven't been trades but plants and seeds purchased from supposedly reliable sources.