@Elluminatus You could use MQTT persistence service to update state across multiple openhab instances. Here I am using nodered and MQTT to connect openhab with fhem and some other systems I have here.
The closest thing is probably the MQTT Event Bus. All events from all OH instances get published on this MQTT bus. It takes some work though to set up Items in both instances to avoid update loops but it can be done.
The most successful implementations I’ve seen have on OH instance be the “master” and the others be “slave”. The slaves just react to commands and publish updates. The master is where the main rules, persistence, et al reside.