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the 182 upper WILL fit. Requires one hose take-off blocking, and you can't fit one bolt (insignificant). Not that it would give you an improvement on a cup.
the process of matching using a CNC machine doesn't necessarily make the matching better than doing it by hand, it's just a fast, and very repeatable process. Only the lowers have ever been CNC'd by anyone, the upper is normally either not done, or matched by hand anyway