Hi Spike, tried that already, both part numbers are given with no apparent differences. Sadly the local Audi dealer is closed so I can not check which applies to my chassis. Hey ho.Don't think there is a general 'rule' which applies to a part number suffix.
Sometimes it's an update so the newer version supersedes the older one..... but sometimes they are not interchangeable
Sometimes it can be the same basic part (eg. a mirror switch) but for a different model car
If it's a 3 digit code it can define the colour option.
Safest way is to look up the part number in one of the on line catalogues and check for clues - https://audi.7zap.com/en/rdw/
Cheers Spike
Brilliant, many thanks. My car is right on the cusp 10/02,In this case the revisions are specific to model year and not a supersession.View attachment 64309
Cheers Spike