Mostly christine miller replaced the early chapters of the book. The old ones are evolutionary and she rewrote it from a creationist viewpoint the first few chapters are on nothing new press for a preview. She explains the differences there too.
https://www.nothingnewpress.com/books/guerbers-histories/greeks/
Dont start with yours and order another. Either figure out the differences and add in her free few chapters of preview or waite and order a new one. She also added to a few chapters near the end i think. Also the chapter numbers are off but you can figure out how to align them. I would just use the free preview and then read from your book from then on….unless i had a spare 30 dollers….