Short answer
Comparing two answers does not automatically reveal how closely either matches real-world facts.
Point 1
A comparison tool can show coverage, clarity and contradictions between answers. Without external sources, that is not a measurement of truth.
Point 2
A percentage creates false precision when there is no defined measurement method or verified reference set. A safer output identifies claims and their verification needs.
Point 3
For legal, medical, financial or current topics, return to primary or authoritative sources before making a decision.
Conclusion
The path from AI output to usable work is safer when source relationships, uncertainty and final user review remain visible.