I'm stupid! I could've just searched for the save name through the terminal. For anyone as new as I am to Linux with the same issue, the saves location was /home/t/.steam/debian-installation/steamapps/compatdata/251570/pfx/drive_c/users/steamuser/AppData/Roaming/7DaysToDie/Saves
Told you it was long! And how I found it was with
locate --basename '\220503'
(220503 being the name of the save, so you'd have to change that bit).
Thank you dude. It seems to be the same location that I found through Steam which for some reason wasn't the correct one for me, but I found it! Typical to always find the solution shortly after writing a post, but hopefully it can help someone else in the future.