The West version will use equal or greater amount of hard drive space, because it will include localized audio and text. Even if there is no option for Japanese text and voiceover, English almost always takes up larger space when recorded in equal quality. I don't know if Microsoft's involvement in the game's distribution will add more to the size of the game (even if under 1GB). Last I checked the game is currently just a bit under 80GB for me.
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