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@M_V
I've kinda given up on finding a definitive answer to this because when searching all I find is arguments over whether NJS stamped DA 7600 cranks are JIS, ISO or something in between.
The chainline on a Miche hub (on my track bike along with 7600 crank and 107mm un54 bb) is 42mm and the chainline on a System Ex hub (on the bike the that pair of 7600s that are in the mail are going on) should also be 42mm so it should work, my only concern is that the set of cranks on my track bike have only ever been fitted to un54 bb but that the set I've bought from Japan have been used on something else (matching DA7600 bb probably) and thus, the 2 sets of cranks could have rolled off the production line at Shimano side by side but by being used on different bottom brackets the tapers will no longer be identical.
Should info about previous use of the cranks be entered into the database list?