Guests and Premium features

Ruth, I do not know the scope of all you are requesting but I due know that a guest on one of my teams was able to save an Advanced Search to a CSV file which is only a premium feature and they had a free edition. Would not be surprised if the guests gets the features of a paid organization even if they are free.
But don’t know for sure. One way to do a lot of that kind of testing is to set up a free account under your personal email address and see what the outcome of that might be. I have done this for exactly what you are trying to scope out.