Hi Deepali,
Difference in both HR lies in the level of functioning.While HR is business/plnt specific which functions at the circle level,Corporate HR works at the headquarters level.They are involved in ploicy making ,Manpower planning,budgeting,approvals etc.based on the requirements of the circle office HR.
THrough Circle HR u get exposure on implementing the policies,execution,employee relation management,whereas Corporate would help u to learn more on designing policies,interacting with different circles,understanding trends and ensuring overall welfare of the organization.
Poornima