Here in TX, it's about the same pay as CNA's in the hospital systems I'm familiar with. However, in some systems, the nurse extern has all the CNA duties, plus whatever duties your school documents you've been checked off on, and the facility agrees to allow you to do supervised by an RN. So, here no med admin, assessment, but for example my facility will allow me to start an IV, ostomy care, central line dressing changes, start foleys, etc.
So some things are absolute no's, others are up to the facility. If you work as an extern at my facility, while you have to be a student to be an extern, you are NOT there in the clinical student role. So the rules can be quite different.
Make sure you talk with your director/manager and be ABSOLUTELY sure what you can and cannot do, independently and supervised. A few RN's will assume if you say "yes" that it's ok, others will supervise you getting ice chips
Some will leave without asking if you feel you need supervision, because they expect you speak up if you do- so be vocal about when you need it. Safety first and good luck!!! It's been very, very good for me and I will have a much easier time getting a job I want when I graduate.