The main difference in the two texts is the level of detail. The textbook looks at the big picture, it deals with many years in just a few lines of text. The source above is focused on the detail of the moment in history. All the text is used for a situation of maybe just a few minutes.
Another main difference is the role of the Prince of Orange. In the bigger picture he gets credit for the entire Revolt, but on a personal level he did not sail with the Sea Beggars. Other people did a lot for the Dutch Revolt, but in the grand story they are often forgotten.