Why not just do a Zs test for every circuit, to ensure correct polarity & termination after the change, then RCD tests. Zs would be different from original test, because of RCD's, and trip times would have to be recorded anyway.
The only problem I can see is that if it was a three phase installation you may have two different phases resulting in 400V in the switch. Either way a label stating 400V/isolate from two sources would cover everything.
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