Hello Pankaj,
From what I have understood as per above query, I would like to know if you have tried the concept of 'Lead Consultant' for this CR. I am suggesting here that the Lead Consultant will have the 'ownership' of this CR. So, once the CR is approved by the Change Manager, the Lead Consultant(in your case the Lead) will receive the notification(Workflow trigger). Subsequently, he may add another person as the 'Developer' in the 'Parties Involved' tab and assign the task/work to him.
Kindly let me know if this is useful.
Regards,
Avinash