Apple - How can I see which macOS version is installed on an external disk, without booting into it?

You can read the SystemVersion.plist on that particular volume-

/Volumes/<volume_name>/System/Library/CoreServices/SystemVersion.plist

If there's a valid, bootable system on it, then it will be listed in System Preferences > Startup Disk, with its version number.

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Macos

System Information

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