I'm not sure they are from my experiences...
ISO is a Bubble Flare - having a Convex (rounded) tip which
mates with the concave part in the fitting -ISO brake line))ISO
fitting
SAE? is a double flare - having a concave tip which mates with a
convex part in the
fitting SAE brake line((SAE fitting
I been working on my Buick which has ISO flares and a person
from discount auto sold me double flare fitting for my ISO lines, i
tried to put the on not knowing they were different, but they
didn't fit very well. -ISO brake line)(SAE fitting
I'm sure there might be a way to wrench the thing down on it to
get one to bend. or maybe flare down a bubble flare so it becomes a
Double flare? I'm not sure.
-Brian