Reliability within the VAG

Hello together, a short question, where I am not sure if there can be a short answer ,I hope nevertheless there is one: Why do in the ADAC breakdown statistics actually cut identical or similar cars within the VAG so differently ? Within each vehicle class e.g. Audi is ahead of VW/Skoda/Seat, sometimes even clear . At the same time I thought that most parts are identical. So where do these differences come from ? More care of the holders, possibly other parts, other e Quality assurance? Can one possibly conclude from this also a longer durability? I would like to find an approach very interesting, I find no differences about Google – so except the quality in the interior, which is probably hardly decisive. This should not be worth per or contra of a manufacturer, by the way, I just stumbled over this (neutral) statistics. Thank you already 😉