Payment Terms DA ( Documents against Acceptance) and CAD ( Cash against Documents) through Bank are the same or different?

No, they are not same the difference between DA and CAD is explained below :

D/A – (Documents against Acceptance)

The export documents and a time/usance bill of exchange are sent to a remitting bank. The documents are then sent to a collecting bank with instructions to release the documents against a buyer's acceptance of the bill of exchange

CAD (Cash Against Documents)

This process lacks the security and legal protection of a documentary collection since the exports documents are sent through a remitting bank to a collection bank without a bill of exchange. It is, however, still a collection through the banking system.

The are different in the sense that payment terms documents could be a long term agreements or contracts whiles cash against documents through bank is more of liquidity in nature.