Is the-koran- vastly different from the Bible?
Yes. They just use the same characters and similar events but they say very different things. Readers of the Koran should check the holy prophets that Mohamed states are all the same and see for themselves. They are not the same. Jesus didn’t teach what Moses taught and the prophets in the Old Testament are not all alike.
No the Quran is the final book of both the Bible and the Taurat. Because we believe that Muhammad(pbuh) completed the message from Allah. Those before the Prophet Muhammad(pbuh) go to Paradise those after who dont’ accept Islam don’t go to Paradise. In both the Taurat and the Bible there was stated about Muhammad but the high ranks in both religions cut that out because they wanted their religion to be the last religion and the best religion But Allah ta’ala knows best.