Hi
After reading more about CAN and CAN-FD, I came to the conclusion that Basic CAN and CAN-FD can be present on same network and can communicate to one another provided CAN-FD is sending the Basic CAN frame. If Basic CAN Node detects CAN-FD frame , It will start transmitting error frames so no Node will be able to receive the CAN_FD frame.
Regards
Amit