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I will measure the shaft of my forster tonight when i get home - I will also measure the ID of my outside neck turner to see if it has any give room. All you have to do is measure your RCBS shaft to see if its a go or not. I know pilots do not interchange.
(Edit) Looking on Forsters site the outside neck turner will only fit the Original forster cutter which has a .4902" diameter shaft. It will not fit the Forster Classic trimmer which has a .552" outside diameter shaft. So if the RCBS shaft is bigger than .4902 it probibly wont fit.