How to use different types of dynamixels x-series and pro series together?

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I wave a humanoid robot project and I'd like to use the pro series dynamixel servos for the shoulder joint and the x-series for the lower arm. I know that i need different voltages for the servos, but can I use the same RS485 communication line if the are all the R-type servos?

I have a OpenCM9.04 with the expansion board and an OpenCR1.0 board that I am evaluating, although I plan to use a Raspberry pi as my ROS node.

I guess I am trying to figure out if I can have all the servos connected to one of the boards, and then power them separately. Or will I need to have to separate data paths (and therefore use two USB ports) on the raspberry pi.

Thanks