No, they are not the same thing. When it is being reviewed you will see "Under Review", and when it is done, you will see "Processing is complete." The wait time for "ready for review was 5-6 business days towards the end of June, and the review was on the order of a few hours. Now, however, it may be longer. Check the other thread "AMCAS submitted/ready for review/Under Review" for details on this.