i dont know much about the history of kickboxing but i can answer the second question. kickboxing uses punches from western boxing and kicks derived from karate and TKD. muay thai uses punches similar to boxing, kicks with the shins mainly and allows the use of elbows and knees in most fights except amature. some throws are allowed as well as grappling (or clinching which ever way you say it) for a short while. grappling in muay thai only lasts for 5-8 secs max though.

Next comment: "Hi I am 25-year-old guy wanted to learn [...]"
Previous comment: "i,emmanuel wants your idea"