Difference between Volkswagen Group and Volkswagen AG?

I am doing a thesis where I am comparing automobile manufacturers and in order to compare the right things, I need the matching numbers. For example, in Fiat Group there are separate numbers for Fiat Group Automobiles, then again separate for Ferrari and Maserati and for commercial vehicles. In VW financial... show more I am doing a thesis where I am comparing automobile manufacturers and in order to compare the right things, I need the matching numbers. For example, in Fiat Group there are separate numbers for Fiat Group Automobiles, then again separate for Ferrari and Maserati and for commercial vehicles. In VW financial statements, I have different numbers for the Group and for VW AG, which is used interchangeably everywhere I googled, but the numbers are totally different from the Group's numbers. Does anyone know which brands are in VW AG?
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