I have same question...basically..is that one credential the same across all modules (even KSDU).
Right now I have been trying to set the credentials in the Audit for a specific test Org...then what I did was use a new Policy that would set the Org Default (which I configured) and then I applied that policy to the Org which in theory should change the agent credential for Everything (agents, KSDU, etc)
Is this incorrect assumption?