The RGBpx connector is called Molex Picoblade. The Pins are 1.25mm apart.
The RGBpx connector is 4 Pin, it has Power (5V + GND) and Data in + Data out.
On the OCTO/Farbwerk, you only need to connect Power and Data out. The Data in pin is not required.
Hi
Looking at the OCTO which are the Power & Data Out pins on the RGBpx headers please