Kickboxing vs muay thai?

idk y but alot of people say kickboxing does have knees and elbow but i kno one that does and if a kickboxer and muay thai guy went against each other and the kickboxer was taught to use elbows knee the clinch and shin kicks both the guys are 16 same age same kick power knock out power,stenghth intelligence speed coordination agility and condition ing both fight alot with frends all the time with their own respective matial arts and fighting styles and the muay thhai and kickboxing won every one of them both are 25-0 then they meet become friends and wanna fight so they agree to the rules they go to a local mma place and set up a fight the both have the same agressiveness and will to win who would win