Is Pega using the BPMN2 standard notation? If so, you just need to configure your environment and run it inside jbpm. If no, you will need to migrate your process definition to BPMN2
The pega documentation says that the process is not BPMN 2 standard, but something close to that( not sure what?). But as i know IBM BPM(Lombardi) is BPMN 2 compatible. Now my question is what is the configuration that you are explaining, are there any documentation available on this, also i am not sure what will happen to all the Human Service and System services attached to the process.
Any help will be appreciated.