Not only are there seven extra books, there are also extra books and verses in some of the books that Protestant Bibles contain, especially Daniel All the extra books and chapters are in the Old Testament. The Catholic New Testament is essentially the same as Protestant Bibles. And for you don't change the KJV people, the KJV has been changed numerous times since the original 1611 version came out. The last major change was when the extra books from the Roman Catholic Bible were removed from the KJV. That happened sometime in the 1700s, if I remember correctly. During the first 20 years or so after the KJV came out there, were also numerous changes made to it. The authors of the KJV never made any claim to be inspired, despite what lot of people today believe. The extra books and chapters are considered valuably to study, even if they aren't conical. Actually some of them are quite interesting and provide extra Biblical information about what happened during the 400 years that the Protestant Bible goes silent, between the Old Testament and the New Testament. BTW I'm not Roman Catholic, I just study the Bible a lot.