I once took some of my favourite books (from when I was a teen) to get signed by an author as an adult. I bought one of the ones they were promoting but also brought my olds ones and asked if it was okay if they signed them. This particular author was so thrilled that I had the first print run copies of these books from years back.

It was a really lovely experience. I say take the old book, and yes bring the new one, and just ask if he’d be okay signing your older copy of Eragon.