Between Shichida and Heguru? Not a whole lot. Both originated from the same source so the programs are both very similar.
TweedleWink, on the other hand, differs in more ways. I have an article covering the three schools here:
http://www.figur8.net/babytalk-article-the-top-3-right-brain-schools/They are based on the three schools in Malaysia. I have not attended Shichida or Heguru in Australia so there may be differences again there but I should not think that they would differ greatly.