I googled it, and indeed, we are using the same type of noodle (kuey tiaw). However, I suppose the difference lies in the fact that you use the term "kuey tiaw" to refer to any noodle dish with soup, rather than specifying the particular name of the noodle. In Malaysia, a noodle dish with soup can be called "kuey tiaw soup," "beehoon soup," "yee mee soup," "chow mein soup," "pan mee soup," "kolok soup," etc., each referring to a different type of noodle.