Woodstock and rangemaster voltage question

[Jules]

I am building a Woodstork and rangemaster in the same box. They both have voltage inverters to provide -9v for the past transistors and I wanted to know if I can eleminate one of the charge pumps. I am using a double foot switch pcb as it makes the wiring a lot easier as I am incorporating an order switcher also.
So the power goes into the foot switch pcb then out to the 2 circuits each with there own voltage inverter. Can I take the -9 volt off 1 board and use it to power the 2nd one?
If I don't use the charge pump on 1 of the circuits would that change where the power enters the circuit?
I have also thought about using a road rage before the power enters the foot switch pcb
To provide the circuits with -9v but am still a bit unsure of the question above 'where to enter the power on the 2 circuits if not using the charge pumps.
Hope I haven't made this to confusing, any help appreciated.
Jules