The two measurement results are identical to the slightest degree.
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分 (fēn) and 毫 (háo) are both ancient units of measurement — 分 is one-tenth and 毫 is one-thousandth of a 寸 (cùn, Chinese inch). Together, 分毫 refers to the tiniest possible amount, used idiomatically in phrases like 分毫不差 (not off by even a hair).