At least we can go back to the source of what was copied to check, but you cannot do this, because Uthman destroyed the source of his Quranic recompilation. No one can check to see how well he copied from Hafsah's original copy that was destroyed as well.
We had kept the thousands of differing copies, but none of them differ when it comes to the central gospel message. As I mentioned, we don't base our salvation on the torah which is a common source for both of us whether you except it or not.