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Sheldon Brown's Bottom Bracket Size Guide suggests that for Shimano 7400/01/02 cranks, the 112/113mm BBs have axles that are 3mm longer on the right hand side.
https://www.sheldonbrown.com/bbsize.html#dura
I only know this because I was looking for what size I needed.
fizzy.bleach
Ah right may well be, that makes more sense too.