Yes the other book was inscribed personally by Jackson. This was brought up in the trial. It said
"Look at the true spirit of happiness and joy in these boys' faces, this is the spirit of boyhood, a life I've never had and will always dream of. This is the life I want for my children."
Seems a very strange thing to write in a book by pedophiles, for pedophiles, with images such as the ones you described. Also both books were locked in a safe and not with the general collection. He knew full well what they were and what they represented