Can the GT-AX11000 Aura RGB be synced with all others Aura devices?
No, the Aura of GT-AX11000 can't be synced with other Aura devices.
For more specifications, please refer to the below link:
Introduction of Boost Key button
The button is default set to the Aura RGB feature. Press this button to turn on/off.
Dashboard allows you to define the functions of Boost Key.