First of all, your Rallye should have an ASU code gearbox, the CBC code box was only fitted to the Passat G60 Syncro from Feb 91 to Jan 93, if you check your transfer box casing you will see that it is made out of aluminium, the correct Rallye transfer casing is made out of cast iron.
As for the oil capacity,
02C cablechange box with code ASU 29059 onwards & all other cable change gearboxes 2.4 liters.
your gearbox has oilways & will automatically fill the transfer box up to the correct level