worpress rest api

the idea is to run 2 wp sites from 1 dashbord the ability to manage all posts pages including its feautred images and plugins for both websites from one admin panel. however website 1 is up and running website 2 does not exist yet so first install new wp and have all my old site posts and some of the plugin on new site then to have the option to add update posts for both sites from 1 admin panel since i want the old site and the new site to have the exact posts just on diferent server and different domain why not save time and manage both under one admin panel to save u some time wp multisite feature is not the option thank you pleaee inbox if u have any question