Hi Antony,
You can change the IP addr in the VTY config. You can for instance add a 127.0.0.2 to your loopback iface and then point one of them to use that IP addr.
See for an example vty cfg: https://git.osmocom.org/osmo-gsm-tester/tree/src/osmo_gsm_tester/templates/o...
line vty bind 127.0.0.2 ctrl bind 127.0.0.2
The default value used if not specified is 127.0.0.1