Can the Cult of Ulric list take empire units that are not listed in it?

For example can an Cult of Ulric list take handgunners, lance armed knightly orders and have detachments of halberdiers for their warriors of ulric?

And likewise, can an empire army take the priest of ulric or any units of the cult of ulric in their list?

If the answer is yes to either of these, where can I find the rules saying so?