Switching between two almost identical state machines in one program

[Amr95]

I have a program that it is basically a state machine that opens and closes different valves with certain time delays. I need to implement another state machine in the same program that does the the same except two states of the implemented state machine and I need to be able to switch between them. What is the best way to go about it?

[altenbach · Accepted solution]

Keep the bulk of the state machine as is and use case structures where the code differs.

(I assume that only one is supposed to run at any given time).