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I do not have any experience with this, but did you look at:

5.8.6. Updating processes and  5.8.6.1. Process instance migration

Whenever a process is updated, it is important to determine what should happen to the already running process instances.  There are various strategies one could consider for each running instance:

• Proceed: The running process instance proceeds as normal, following the process (definition) as it was defined when the process instance was started.  As a result, the already running instance will proceed as if the process was never updated.  New instances can be started using the updated process.
• Abort (and restart): The already running instance is aborted.  If necessary, the process instance can be restarted using the new process definition.
• Transfer: The process instance is migrated to the new process definition, meaning that - once it has been migrated successfully - it will continue executing based on the updated process logic.

Regarding the knowledge base, should that not be instantiated only once at the very beginning? I think processes can be deployed to a running knowledge base.