I am sure someone will be able to reply with more certainty but I am sure you will find that your kids get the kid packs no matter who you booked with. I don't know if there is an age limit, I can't see anything in their brochure about this. I suppose it depends how old your kids are, what you get may not appeal to a teenager.
From what I have heard the kids pack will have toys, games, sweets and a book.