I would say they do have very few things in common,yemen are a more desert and dry environment type of chameleons and peacocks as well as most trioceros are low temperatures high humidity and oversensitive to oversupplementation.
I would check before buying to be sure that I have a good gutloading basis.
also they may be sensitive to handling so you have to be willing to commit to keep your hands off if they don´t response well to it