The cashbook is where the company records and keeps track of all transactions in their bank accounts. When the cashbook of a bank account contains all transactions, its balance should be equal to the banlance that the bank has in its passbook.
The passbook is where the bank records and keeps track of all transactions, whether they are withdrawals (reduce balance) or deposits (increase balance). The passbook is issued to the account holder so that its balance and transactions can be checked.