These modes of reading aimed at the same point, not different in respect of lawful and unlawful.
Sunan Abi Dawud Book 8, Hadith 61
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I heard Hisham b. Hakim (b. Hizam) reciting Surah al-Furqan in a different manner from my way of reciting, and the Messenger of Allah (ﷺ) had taught me to recite it. I nearly spoke sharply to him, but I delayed till he had finished. Then I caught his cloak at the neck, and I brought him to the Messenger of Allah (ﷺ). I said: Messenger of Allah, I heard this man reciting Surah al-Furqan in a manner different from that in which you taught me to recite it. The Messenger of Allah (ﷺ) the told him to recite it. He then recited in the manner I heard him recite. The Messenger of Allah (ﷺ) said: Thus was it sent down. He then said to me: Recite, I recited (it). He then said: Thus was it sent down. He said: The Qur'an was sent down in seven modes of reading, so recite according to what comes most easily.
Sunan Abi Dawud Book 8, Hadith 60 Next Hadith → The Prophet (ﷺ) said: "Ubayy, I was asked to recite the Qur'an and I was asked: 'In one mode or two modes?' The angel that accompanied me said: 'Say, in two modes', I said: 'In two modes', I was asked again: 'In two or three modes'. The matter reached up to seven modes. He then said: 'Each mode is sufficiently health-giving, whether you utter 'all-hearing and all-knowing' or instead 'all-powerful and all-wise'. This is valid until you finish the verse indicating punishment on mercy and finish the verse indicating mercy on punishment."
Sunan Abi Dawud Book 8, Hadith 62
Sunan Abi Dawud Book 8, Hadith 60 Next Hadith → The Prophet (ﷺ) said: "Ubayy, I was asked to recite the Qur'an and I was asked: 'In one mode or two modes?' The angel that accompanied me said: 'Say, in two modes', I said: 'In two modes', I was asked again: 'In two or three modes'. The matter reached up to seven modes. He then said: 'Each mode is sufficiently health-giving, whether you utter 'all-hearing and all-knowing' or instead 'all-powerful and all-wise'. This is valid until you finish the verse indicating punishment on mercy and finish the verse indicating mercy on punishment."
Sunan Abi Dawud Book 8, Hadith 62