[tor-relays] Nyx questions

[G]

I have a few questions involving mostly the connection information 
provided by Nyx.

In the past I have used standalone tor as a proxy for Firefox. At times 
Nyx would show my internal 127.x.x.x as the 'originating' IP and other 
times would show my internet facing 183.x.x.x as the originating IP.

I now have two Ubuntu machines with older OS versions running Tor 
Browser 9.5. One machine has Nyx (-i 9151) showing the internal 
127.x.x.x while the other shows 24.64.x.x as the originating IP.

What is the significance of these differences?

On a different topic are the torrc options the same for standalone tor 
and tor packaged with Tor Browser?

For example with Tor Browser can additional socks ports be opened and 
utilized (obviously while Tor Browser is active)?

Thanks (sorry if this info is documented somewhere - not easily found?)