don't change the snippets and close 1 CB --> that's how I saw it for the very first time.
I think (personal opinion), it should be more or less th same and how and when the default.conf is saved).
One CB open, and you change some params, the other CB has no knowledge about it. I think this is safe enough though. If in the other you change something conflicting, well yeah you got into trouble, because you were looking for it ;-)