As long as neither is admin or root... and try to use different passwords on each miner, test them BOTH (WebUI and SSH). I clearly remember having changed a web password in an S9 that did NOT change the SSH password. This might have been fixed at a later firmware version, or it might depend on model.
Make sure you stick to Linux in your mining operation, all you need is a browser and a console anyway, and the password manager of course.
Leave windows for games at home, only use Linux for serious things. Also always keep around a live iso, optical disc or usb thumb.
Don't say "i don't know Linux", just USE it. Download it (its free) and start using it right away, if you can use a computer, you can use Linux. Anything you don't understand, search online or ask in forums, chats, etc.