There are definitely more parts and more music in Aladdin JR. The length of the JR show is about 60-70 minutes and the KIDS version is approximately 30 minutes. Iago sings with Jafar in "Why Me" in the JR version and only has to act in the KIDS version. The Sultan only has to act in the shorter version. Guards and ensemble are the best places to augment cast in both versions. The KIDS version has Junior Djinn (room for many!) which are spirits of the cave and add the mystery to the show. Peruse both Alicia. The length will determine your decision, both can use many kids in the cast.