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You don't see the raw data in Preview, but the embedded camera-processed jpeg.
Adobe Camera Raw is a different raw processing engine that will give a different initial result. You're supposed to use the sliders in ACR to get the result you want, not the result the camera wants.
With raw files, there is no such thing as an "original" image. It has to be processed to produce an image at all, and a lot of parameters have to be set.