the drawing is incorrect and doesn't show these in proper relative dimensions.
the one order of free masonry: do what we say and learn what we teach you even if it's wrong information about what the real stuff is.
'coders'
https://www.thisiscarpentry.com/2018/02/02/rules-for-proportion/
This article explains the way that actual orders of columns are sized and proportioned in a way that builders and carpenters understand.
if you were to use the Tuscan order to replace a Corinthian order column, the Tuscan column of the same height would be substantially wider girth.