First, I guess I should note that it is controversial that DA 7400 cranks use ISO taper at all, as I have seen many people say they are JIS. But I am pretty sure they are ISO based on reliable sources.
What I don't know is if there is any difference between the 7400, 7401, 7402, and 7410 cranks. Are they all the same? All ISO?
I am just wanting to make sure that I can swap cranks with someone and not have an issue.