Yet more Muon ca sync fixes 17

It's another round of CA sync changes. As usual, it will not run in production.

In my local q449 test, this removes the SlowMuon differences.

Py:diff-root         INFO comparing [2953] leaves over entries...
Py:diff-root         INFO Found [8027856] identical leaves
Py:diff-root         INFO Found [0] different leaves
Py:diff-root         INFO all good.

🙃

cc @elmsheus @jcatmore @mhodgkin