It's the same book, and they're absolutely stuck in it somewhere. Who knows who's closer to the end of it.

As it is, Gongenzaka nods and quietly takes a seat next to the other, doing just as Héctor offers by taking one from the pile. "Aaauh, thank you, Héctor. Perhaps later, we can even compare findings!" It's easier to enjoy the research into runes when he's talking about it with someone- it helps to not think about the fact that they're both looking into it for...well.

Danger related reasons.