What is the difference between bún tươi and bún khô? There are two versions of Vietnamese rice noodles available. I'd like to know what is the difference, if any. They seem almost identical. 


bún khô
bún tươi
I'm going to go out on a limb and say that there doesn't seem to be a difference in the two. They are both rice vermicelli noodles. 

While I found very few search results in English, they appear to be the same. I also searched images and found that there are packages of each but there are also packages labeled like this:



So I came away thinking it's more semantics than anything.