My guess, after looking at the info
here and
here, would be that the difference is probably just the bushes and that AG is an earlier part number. In the ETKA link, the AG part's bushes are listed as "use if required", whereas the AN part states "also use", leading me to think the difference might just be that the AG part came supplied with bushes while the AN part did not. Personally I'd probably take a chance and order the AG part.
On a number of occasions I've ordered alternative parts with a different suffix that turn out to be identical to the original part.
By the way, if you find your rear diff bracket bushes are knackered too (as mine were) and you can't find a good D2 bracket (4D0599285), I can confirm a D3 bracket fits perfectly (4E0599285)
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Mark
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2002 FE S8 Ebony Black Pearl
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Cars Owned:
The Tesla Era: 2020 Model S Performance Ludicrous+ (present)
(Black, with all black premium interior and carbon fibre décor, 21" sonic carbon twin turbine wheels and FSD capability)
The Audi Era: '97 A8 4.2 (Ming Blue) --> '96 A8 4.2 QS (Dark Green) --> '02 FE S8 (present)
The Citroen Era: '84 BX 1.6 RS --> '89 BX 1.9 DTR Turbo --> '94 XM 2.0L Turbo --> '96 XM 2.0L Turbo Exclusive --> '00 Xantia Activa 2.0L Turbo
The Banger Era: '76 1.2L Lada VAZ-2101 (Ruski Fiat 124) --> '80 1.7L Morris Ital HL, finished in Ermine White and Rust