difference between iwata´s hi line and custom micron



i was watching chicago airbrush supply web page,and that they had a some bargain with iwatas, so this made me recall that there actually two airbrushes that are almost the same: the hi-line and the custom micron.so my question is: what´s the difference between both?

i will apreciate any light in this case.
il bet not much thats another gun i would not mind trying for myself i think its the way the micron atomizes the paint il stay out of this one and see the replies myself
Air chamber of the micron is much finer, means incredible detail, but it won't do the bigger background work like a hi line.