Exclusionary Difference
a difference in one or more characteristics between compared items that is sufficient to determine that the compared items did not originate from the same source, are not the same source, or do not share the same composition or classification.
Also referenced in ANSI/ASTM E1732 Standard Terminology Relating to Forensic Science
ANSI/ASTM E1732 Discussion—What is sufficient depends on the performance and limitations of the method used on the material in question.