The inside faces of the 20" FE wheels were factory shot blasted by Audi, not painted, and then the front faces were diamond cut -any refurb will not be able to replicate the shot blast effect fully, but may come close if it, particularly if they can create a colour which is close to "white silver" effect on the inside edges.
Any diamond cut (original or refurb...) is more prone to problems than a normal finish, but this can be reduced by protection with a further aftermarket coating, such as Metalmate.
Hope this helps.
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