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@HelicopterHelicopter
You said
“My Royal H has a modern TA crankset I ran it with a 107 Shimano BB for a few years, I tried it on another bike with much larger chainstays and the the ND side hit the chainstay. When I went to reinstall them on the Royal H I installed them with and 111 Centaur BB and it fits the same.”
Which implies you meant that the chain line, chain stay clearance etc were exactly the same, since as you put it we don’t measure BB’s from the centre out the difference between the two tapers is half the total difference between the two lengths I.e. (111-107)/2=2