godsent,
There are no surviving “originals”, so to speak. The OT started being penned some 4000 years ago - there are no surviving scrolls from that era. What we have are copies of originals (some surviving texts precede Islam by a couple of centuries) - the Muslims like to claim that since it’s not “original”, something was obviously mistranslated. They use this “factoid” to claim that where ever the Qur’an contradicts the OT, the OT has been mistranslated or otherwise “botched”. This makes for very slippery arguments, as they default to “mine’s right, yours is wrong” and won’t listen to counterargument.
The thing they don’t talk about much is that they don’t use the “original” either. The “original” was destroyed by fire, but later re-transcribed based on the “memorized” original. Since then, their Qur’an has been “updated” with dotting and diacritization. Dots were put as syntactical marks by Abu Al-Aswad Al Doaly, during the time of Mu’awiya Ibn Abi Sufian (661-680 AD). The letters were marked with different dotting by Nasr Ibn Asem and Hayy ibn Ya’amor, during the time of Abd Al-Malek Ibn Marawan (685-705 AD). A complete system of diacritical marks (damma, fataha, kasra) was invented by Al Khaleel Ibn Ahmad Al Faraheedy (d. 786 AD). All of these “updates” could very well have changed the meaning of several words - they rely on the ignorance of their critics to make the arguments they do.
Good luck! There are several more learned folks in the “Non-Catholic Religions” forum who could give you far more info than I - there are currently several threads about Islam, and you may try starting there.
God bless,
RyanL