It only shows to compare everything. And confirms that computer sourced SQ is usually poor.
At least you didn’t specify the external DAC. Probably not it’s fault.
This also confirms that CDs often sound better than files.
All else is inconclusive.
The title of your post is WRONG.
Not comparing. Try the SPDIF out of the CD for a more valid comparison. You still have to factor in possible inter cable losses.