RE050A - Bridgestone tire confusion

[kozmos]

Pls help me here. What's the difference between RE050A vs RE050A Pole Position vs RE050A Extra Load?

Why can't they just give the tires a different name?

[rjkflyer]

The Potenza RE050A Pole Position is designed to provide exceptional dry and wet road traction along with more responsive handling than the Potenza RE050A.

For the RS4, i think you need the 255/35 R19 96XL (extra load) variants.