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signal end event is sort of a broadcast event within scope of ksession. So it will signal all matching process instances, by matching I mean process instances that are waiting for given signal name. So to answer your question - yes you can signal another process instance just make sure that the other process instance is waiting for such signal.
How can I configure process to signal?
specify signal ref on both throwing event (like end event) and catching (the other process that needs to receive signal. Make sure that you define same signal ref so they can be matched and signal will reach the right process instances.