Here is an article from Drugs.com comparing the two:
https://www.drugs.com/compare/aranesp-vs-procrit
Good for you, making a list of questions. That is important, as we can get overwhelmed once we are in the doctor's office, and forget to mention something very important that we wanted an answer to!

If she does not have a nephrologist, make sure to enquire about getting one onto her medical team. They will take into account any other health concerns, and recommend her amount of fluid intake per day. But, also be careful, as too little hydration can lead to its own set of issues, like a Urinary Tract Infection [UTI] or abnormal blood test results.
Ginger