Docmo....Very interesting and thought-provoking question. I'm going to say that I'm sure events in History do change from country to country...perhaps even stories within the same country, but different AREAS...(I'm thinking of our North and South?)
The content & context of a history book would seem to depend on so many variables.....The author: How well-researched he/she is and of course, the source of this research, An authors stand or point of view on certain incidents within an Historical Saga.
Unless a History book is written to teach young children, I would not justify omitting vital statistics, unpleasant details or hard core facts of reality. History is what it is....rather WAS. Altering, omitting or any type of "personal" input from an author that steers too far from the facts, is pointless.
Let's assume that a book will be written one day by A Syrian Rebel....and one by a Syrian Dictator......I'll make a wild assumption, these historical tales will be BEYOND different............Did I answer this "A-OK" in terms of your question??