Reportedly, the changes are minor updates to keep things fresh. You should be fine studying even with old books.
I was in a similar circumstance 3 years ago, as CISSP changed from 10 to 8 domains. It was a much bigger change than today's. None of the third-party reference material had been reorganized, so it technically was outdated, yet it was the only thing available for my studies. Like you, I worried about the differences. Since the exam is more "conceptual" and less "detail", you probably will not even realize that there was a mismatch. I didn't.
If you feel that the books are simply reinforcing your on-the-job experience, you will likely do well. Problems come about when one tries to use the book(s) as substitute.
