Comparing two Englisch texts for consistency (mashine translation vs man-made translation)

Comparing two texts for consistency. One is a man-made translation and the other one is a software-based translation (machine translation). It is about 90 k words. To complete the projects you will need to read BOTH texts side by side. In another words, you will have to read 180 k words. Only significant deviation must be highlighted in the text (missing sentences, reversed meaning of sentences etc.). In an ideal case, there should be no deviation at all, but human make mistakes ….