How to configure 2 Universal Forwarder instances (Splunk 6.1.3 and 6.3.0) on a single AIX machine?

Hi All, I am planning to configure two Splunk Universal Forwarder instances on one of our AIX machines. Version of Splunk 6.1.3 & 6.3.0. What are the places that I need to make changes in order to make the two instances run with out any issues? I have changed the web.conf by changing the management ports. Help in this regard is very helpful. Regards,