Remember that the HC lists are not intended as tournament lists (in fact, HC is not intended as a tournament game), so you can make every change you consider appropriate for your games and/or scenarios.
I don't have the lists book yet (still on its way from the States to Chile), but I intend to use it as a "starting point" for my own lists, using my DBM and FoG army books to fine-tune them. In fact, I already started to design a Mid Republican Roman and a Later Macedonian list, both based on my FoG armies with a few DBM touches, to recreate the battles of Cynoscephalae and Pydna. As soon as I have some advance on them I'll post it here on in the main HC forum.
Good luck with your army