Yes, you can use the exact same WiFi name (SSID) and password in as many locations as you want. A very good idea!
I recently installed Orbi's in two houses, only these are 3,000 miles apart. In order to give myself a way to administer the one faaaar away, I set up Dynamic DNS and OpenVPN on both of them. Works great, however what I did not think about was what would happen when I VPN'd into the remote sysem. I had taken the "default" IP subnet for both systems (192.168.1.x). So, when I ask to open a web page during a VPN session, does my browser say, "oh, THAT 192.168.1.x is across the country." Or, does it say, "Wow. Good thing there's a 192.168.1.x right here on the LAN." So, what I do is start up a WiFi hot spot on my smartphone, disconnect the laptop from my local network, connect to the hot spot, start up the VPN, do my business, and undo all of that.
I would much rather simply use a computer on my local network, VPN across country, do work, and turn off VPN.
If you do not need remote access to the Orbi, of course, all this does not apply.
