I think 314mm brakes had dampers to reduce noise and 323mm did not as there was not enough space if fitting 16-17" winter wheels. They are interchangeable as long as you have enough space for dampers. If itiing the ones without dampers they may squeal a bit but like MJ says adhesive backing should eliminate that.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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