If the LEDs are ARGB (5VDC) you need a Farbwerk360 which is an ARGB controller. The RGBpx ports on an Octo, D5 Next, etc, are also ARGB but they are more limited than the ports on a Farbwerk360. If you have 12VDC analog LEDs then you need the Farbwerk controller (no 360 at the end).

If the fan RGB has standard ARGB connectors, you will need Aquacomputer ##53285 adapters which allow ARGB devices with the "standard" ARGB connectors to connect to an Aquacomputer RGBpx port. You will also need an RGBpx cable like the #53261. These are available in several lengths. If you want to make your own, they are Molex Pico-Blade connectors. Much better than the horrible standard ARGB connectors but you do have to treat them gently.