Hi,
You can use DNS Rewrite on the ASA code 9.3 for the same functionality.
More information about the similarities:-
http://www.cisco.com/c/en/us/td/docs/security/asa/asa82/configuration/guide/config/inspect_basic.html#wp1335922
Configuration on ASA 9.3:-
http://www.cisco.com/c/en/us/td/docs/security/asa/asa93/configuration/firewall/asa-firewall-cli/nat-reference.html#pgfId-2006959
Thanks and Regards,
Vibhor Amrodia