Originally Posted by Bass Thumper
Perhaps someone here has a tool that can do the following subtraction: Original Bass Track - Separated Bass Track = The Difference
If "The Difference" isn't exactly zero in evey bar and at every millisecond, then there would be some level of distortion or artifacts at play.
Use any DAW. Load the original bass on one track and the separated bass on another, making sure they're both aligned. Using a plugin or tool of some sort, invert the polarity of ONE track. Then play back both tracks together and you'll hear the difference. If you then render the output you can then see the difference.

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