[Help with TT sync controller (CL-O015-PL00BL-A)]

Hello,
I need help to connect my Thermaltake TT Sync controller to my AORUS B550 Pro v1 MB.
If I refer to the controller documentation, I have to use the Gigabyte cable to connect the controller to the MB. 
However the Gigabyte cable has 3 pins dupont connector (VDG) and the MB offers a 4 pin connector with a gap between the G and D pin. The Gigabyte cable connector only covers 2 out of 3 pins.

• Is it important that all 3 pins are connected?
• Can I change the Gigabyte cable dupont connector with the one for Asus or MSI which has a 4 pin connector that looks like the one on my AORUS MB ?

I know it's DIY but I don't see any other solution
I don't want to burn out my controller or my leds

Thanks for your help