Hi, jestelle
Thank you for the comment. While it could vary, I think in practice it does not given that it is provided as part of a the following script solution provided by glowforge staff, and it can be found in more than one location on the glowforge site. Here is one example: Need Actual Way to Find MAC Adddress - #4 by dklgood. I pulled it directly from the script to use in my own case and it worked, so I think that address is fixed in the current setup software. Of course, an update on their part could change it, but then it would make their own guidance out of date, so I think they would need a compelling reason to do so.
fetch('http://192.168.192.1:3000/setup/connection_status').then((response) => { return response.json() }).then((data) => {console.log(data.address)})
Happy cutting,
Dave