5Q0955547B is rain and humidity sensor, 5Q0955559B is just rain sensor. Both of them seems to have light and rain sensor. I know that there are some implications depending of what is currently installed in you car, but don't know the details. In my Leon (facelift) I've got 5Q0955547B installed though
 
I once installed a 5Q0955547B as a replacement in a pre-facelift Octavia 5E, and it worked without any problems. The original 5Q0955547 was installed. It's a rain and light sensor.