oṁ ity ekākṣaraṁ brahma vyāharan mām anusmaran yaḥ prayāti tyajan dehaṁ sa yāti paramāṁ gatim

"After being situated in the yoga practice and vibrating the sacred syllable om, the supreme combination of letters, if one thinks of the Supreme Personality of Godhead and quits his body, he will certainly reach the spiritual planets." If one actually understands that omkara is the sound representation of the Supreme Personality of Godhead, whether he chants omkara or the Hare Krsna mantra, the result is certainly the same.