Sorry but I was finishing an AWESOME posting here and my computer reset all the words I have written

I will try to remember...
Lethwei and Muay Thai are almost identical in concepts and fighting structure but in the first one are allowed some techniques on fights that are forbidden in the second one, the head-butts for example. Also in Thailand exist Muay Boran, a traditional Muay Thai who use rope bandage for fighting.
In Laos and Cambodia there're many combat systems very similar to Muay Thai/Lethwei because all are countries in the same geographical area. At the end and IMHO they have one of the most effectives combat sport in the world, and are very good fighters.
Take care to all
Juan Carlos
EBMAS Cuba