Hi @Ashwini_Kumar, welcome to the forums! Yes, you can reassign tasks in both. The steps are different in each, and are also available via the API:
- C7: see the documentation here - you can reassign tasks in the UI.
- C8: in C8, the user would need to unassign the task from themselves in Tasklist and the other use can claim it, or use the API with the
allowOverrideAssignmentflag.