Answer:
Appendicitis is inflammation of the appendix. The term Acute or Chronic refers to the amount of time the condition has been occurring. Acute conditions last for less then 6 months where as Chronic conditions last for 6 months or longer.
So to answer your question, yes they are the same, however saying "acute appendicitis" is a more specific term and would refer to appendicitis lasting less then 6 months. In almost all cases appendicitis is acute as the infection, inflammation and swelling of the tissue is a medical emergency in which the appendix must be removed before it bursts.