synchrounous scene switching

So, I am pulling the video from one NDI source and the Video and Audio from another NDI source. If I switch between sources the audio starts to drift and become out of sync. If I right-click on each source - properties and select refresh NDI source then everything seems to get back into sync...

Is it possible to switch scenes (preferably via StreamDeck) on two OBS instances (running on different machines) synchronously? Background To improve the reliability of our webcasts, I'd like to add a backup OBS machine which has the identical setup like the main OBS machine. The main machine...