I think you should go with the same part number, unless it is a superseded part number. There are differences, for example mine ends in BT which is very hard to find. I can only assume it has something to do with the ACC
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2008 (facelift) S8 with B&O, ACC, glass sunroof, reversing camera, front and rear heated seats, ceramic brakes, homelink, electric side and rear blinds, ski load through, heated fan washer jets, remote boot closing, de-flapped manifold, fridge, umbrella holder 
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