I got a collection of old school books from when my grandparents passed away and can confirm about civics and a lot of other stuff. Another difference is the clarity of the writing in some of those textbooks, specially the math ones.
"This is Master Obi-Wan Kenobi. I regret to report that both our Jedi Order and the Republic, have fallen with a dark shadow of the Empire rising to take their place. This message is a warning and a reminder for any surviving Jedi. Trust in The Force. Do not return to the Temple... that time has past. And our future is uncertain. We will each be challenged. Our trust. Our faith. Our friendships. But we must persevere. And in time, a new hope will emerge. May the Force be with you, always."