5Q0411105CH front springs from the Passat B8 would lower the front of the Superb MK3 by about 11mm according to the specifications of the Eibach and Sachs springs, and about 16mm according the specifications of the KYB springs. However, the KYB springs wouldn't necessarily lower the front ride height more than other springs that are sold to replace this OEM part number because there are often mistakes in the specifications given by aftermarket spring manufacturers.
Fitting Passat B8 springs and shock absorbers to a Superb MK3 won't necessarily make a Superb MK3 ride and handle like a Passat B8 because the Passat B8 also uses different anti-roll bars.
The Kilen/Lesjofors spring catalogue only gives OEM part numbers for the Superb MK3 2.0TDI 4x4 150PS/190PS/200PS with standard ride height. The Sportline uses lowered/sports springs.
Skoda Superb MK3 2.0TDI 4x4 Hatchback, standard ride height, 110kW/150PS, 140kW/190PS, 147kW/200PS
5Q0411105GN front springs
3Q0511115AL rear springs (weight range 4)
Skoda Superb MK3 2.0TDI 4x4 Estate, standard ride height, 110kW/150PS, 140kW/190PS, 147kW/200PS
5Q0411105GN front springs
3Q0511115M rear springs (weight range 5)
Notice that the hatchback and estate uses the same front springs, and the estate uses rear springs just one weight range higher than the hatchback rear springs.