Multisite from different domain servers

Hi, I have two wordpress installations, both in different domains hosted on two different servers. The first is at https://anetz.in and the other is hosted on a free subdomain at https://freenetz.comeze.com

what i want is to host both the installations in my own domain {want to move from external free subdomain to my own subdomain} and connect them through multisite. Can some guide me to move my site including database safely? Please . . . .