Hello friends, The publicly IP is normally dynamic and changes each time you reboot the router but the LAN IP does not change. However, if you change the router, you will almost certainly get a new external IP, and quite probably a different internal IP. For more info- Orbi Satellite Setup Orbi Router Setup
If your device has DHCP configured, the assignment of IP addresses is dynamic within your network, however you must verify what your netmask to assign your IP addresses of your devices.