(Oh we'll the 18' will be cheaper) forget this I'm an idiot lol didn't think before typing.
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Depends what these actually are - are they the common 18 x 7.5 ET51 wheels or the much rarer 19 x 8 ET41 wheels?
If the former then I'd suggest you'd be doing it for track work where the 18s will outperform but may as well go a lightweight option (and you'll obviously need new tyres regardless); if the latter then the tyres would swap straight across with no issues.
Then no problems in using same tyres.
What the hell, seriously? Not sure if I want to spend 60 grand on one now. Isolated case? not with VW though. Wonder if demand for 2nd hand ones are soft because of this reputation? Good luck with yours anyway!