Is There a Difference Between Handwritten and Handwritten Manuscripts?

Before 19 forty seven our earliest manuscripts were from the mediaeval period. And then we find these scrolls in a cave that have texts from a thousand years earlier of the biblical text. Were there any surprises in terms of differences? Or was the the manuscript that we had in the middle ages fairly faithful and consistent with what was written down a thousand years before? It depends on the book, because we sometimes forget that the bible is a collection of books,. each book has a different history.