Morning,
Inclined to agree with Graham here that the part number without a letter suffix at the end will be the earlier generation of the module, as backed up by the information found on the CCCU Wiki:
wiki.a2-freun.de
If you’re unable to confirm what VCDS thinks the part number is as Graham also suggests, then look at the remote half of the key for for its part number. the part number will most definitely be 8Z0837231 with no letter at the end of it. If this is the case then a single lettered suffix CCCU will be required.
If your remote half of the fobs part number has a D at the end (8Z0837231D) then you’ll need you’ll require a double lettered suffix CCCU. Due the the age of your A2 I would put money on it leaving the factory with with a CCCU that has a part number with no letter or a single lettered suffix but it could easily have been changed in the last 23 years by a previous owner.
I’ll go back to what Graham suggest, check to see what part number comes up in VCDS within channel 46 or simply look at the remote half of the key fob for its part number. Hope that all makes sense.
Kind regards,
Tom