The Heavy-Noon ending can be the same while the internal vowel pattern tells you the voice.
PassiveActivePosition
لَا يُفْعَلَنَّلَا يَفْعِلَنَّsingular masculine Ghaa'ib
لَا تُفْعَلَنَّلَا تَفْعِلَنَّsingular masculine Haadhir
لَا أُفْعَلَنَّلَا أَفْعِلَنَّMutakallim singular
Fast clue: active prefix vowel = Fathah; passive prefix vowel = Dhammah.
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Conjugating the Prohibitive with Heavy Noon (Active & Passive)
The Heavy-Noon ending can be the same while the internal vowel pattern tells you the voice.
PassiveActivePosition
لَا يُفْعَلَنَّلَا يَفْعِلَنَّsingular masculine Ghaa'ib
لَا تُفْعَلَنَّلَا تَفْعِلَنَّsingular masculine Haadhir
لَا أُفْعَلَنَّلَا أَفْعِلَنَّMutakallim singular
Fast clue: active prefix vowel = Fathah; passive prefix vowel = Dhammah.