carry forward purchase order and Encumbrance Year End Schedule process Difference

Summary:

What is the difference between the Encumbrance Year End Carry Forward and Carry forward purchase order with future dated shipments schedule process? We have Accrue at Receipt and while processing Year End activities, we do run the "Encumbrance Year End Carry Forward" process but should we also run the "Carry forward Purchase order" schedule process, as we do not carry forward budgets, we have new budgets for a New financial year, what would be the impact, if we do not run this "Carry forward Purchase order" schedule process in Year End? Is there a Check list for Year End