When it comes to mistakes in comparing things, there are a number of different synonyms that can be used to describe this situation. Some common alternatives to "compare error" include "comparison mistake," "comparing inaccuracies," "incorrect comparisons," or "comparison flaws." Other possible phrases that could be used to describe this type of mistake might include "faulty analysis," "misaligned evaluations," "inconsistent assessments," or "discrepancies in judgement." Ultimately, the specific term that is used may depend on the context of the error as well as the tone and emphasis that the writer or speaker wishes to convey.