Differences between hafs and warsh in certain verses

Salam, I’ve recently been looking at the differences between hafs and warsh variants and can understand the difference between most of them. However, I looked at a website recently which said that in Quran 66:12, in the hafs version it says “his books” while in the warsh version it says “his book.” Does this not change the meaning in the verse? Also, there are differences regarding singular and plural in other places as well, so I was wondering if that changes the meaning? Jazakallah Khair