Difference #1: Instrumentation

Although some of the instruments used in Rite of Spring and Mongolian Idyll are similar in timbre, the number of instruments used and their partitions are quite different. The Rite of Spring is written for a large, Western orchestra, while the Mongolian Idyll is written (arranged) for piano, flute and clarinet.  In a more general sense, while orchestral pieces can be frequently found in the Western classical music culture, Central Asian music, more specifically Mongolian music, focuses on one or two instruments, one of which is usually the voice.