An RAE cannot be directly converted into an IU without knowing the source(s) of vitamin A. For example, the RDA of 900 mcg RAE for adolescent and adult men is equivalent to 3,000 IU if the food or supplement source is preformed vitamin A (retinol).
On the other hand, an Associate degree is a title conferred on a student when he completes a college study. Diploma is usually given in vocational or professional courses, like designing, pharmacy and engineering. High schools, trade colleges and professional schools confer Diploma certificates.
A degree is a certificate awarded by the college or university on the successful completion of studies at a particular level in a stream opted by him. A diploma is a certificate issued by the educational institution to the student for pursuing a particular course from the institution and passing the examination afterwards.