There were Comanche Code Talkers associated with the 45th Infantry Division in Europe, as well. One spoke to our homeschool association back in Norman, maybe 20 years ago now.
The big difference is the complexity of the Navajo-based code, which went far beyond the use of an almost-unknown language. Speakers of other Native American languages operated more ad-hoc.
Also a Navajo would not be able to decipher the message unless he was a code talker. The Japanese had a Navajo prisoner and he couldn’t figure out what they were saying, which was not pleasant for him