Audi A6 3.0 TDI 204 vs 245 ps

I'm letting my 2008 Audi A4 2.0 TDI 170 PS Quattro go this summer for an A6 C7 with an 3.0 TDi. They are so nice cars and have some more room for family. Only thing in Norway is that almost all the cars you can find are 204 and not the 245 version. I have seen a lot of speculations on the subject about the differences in the engines. But could somebody that knows maybe tell me?
Found some info that the turbo could be an gtb2060 instead of the 2260, but mostly interested in the fueling and maybe torque limits of the DSG box.
Would be nice to know when thinking about tuning later...

Thanks!

Audi A6 3.0 TDI 204 vs 245 ps