OEM VW DSG6 gear oil vs Castrol / FEBI for Kodiaq 1.4 TSI 2017

Hi,

I am reaching 60,000 KM and should replace the DSG gear oil.

There are two options which are available to me in my country:

Use the OEM version G05 218 2A2

or use the Castrol or FEBI alternatives which are cheaper by 50%

Are there quality differences ?

Would it affect the gearbox lifetime ?

Thanks.