평등 in chinese character is 平等 平means flat->regular 等 means level so it means same level without discrimination. 동등 ..同等 同 means one->same 等 level It has quite similar meaning. in addition we use 동등 to explain 평등 ex)평등은 차별 없이 동등한 등급을 이르는 말이다. but in usage there are something you should keep in your mind we usually use 동등 in logic or somethig like mathematics things. and we usually use 평등 in social things like sex equality.