Implications of using a different ledger for ERP implementation from HCM/Payroll implementation

Our client went live with HCM implementation first and as part of their setups, they created a single ledger and associated a calendar. The rest of the General Ledger setups were not completed. Now we are implementing ERP and would like to create a new ledger and use that as primary going forward. Will this have any implication on the existing HCM and Payroll implementation and transactions? Will there be any changes required from HCM and Payroll side in order to accommodate the new primary ledger. Will it impact any payroll to GL transactions?