Will the Aquabus connector on the Octo be able to operate the Farbwerk?
No. You must connect the OCTO and the Farbwerk360 with USB to the motherboard.
Since I have a spare Sata connector right next to the door hinge of the case where the old fan controller was. I could pull the 5 volt power, power the Octo and the Farbwerk (depending on the power consumption).
The OCTO requires 5V and 12V. The Farbwerk360 only needs 5V.
The SATA power connector is rated for 4.5A load. The Molex power connector is rated for 11A on each Pin.
The hightest possible Load on the OCTO and Farbwerk360 is higher than 4.5A, thats why they use a Molex Connector.