I can also confirm from my experience (and numerical results) that there are clear 'dialects' in the different sections. Sometimes a single feature like words ending in -ody as mentioned above can be found. Remember further that Currier based his A/B classification only on a subset of the MS. He did not use the astro section and little of the pharma (IIRC). These two actually bridge the gap between the two. This gap can be illustrated by words which 'belong' to each section, and which show a typical transition in the language or spelling or whatever:
chol -> cheol -> cheody -> chedy
I don't mean to imply that these words all mean the same! These are simply words which can be found particularly in specific parts of the MS.
I'm still unable to explain the strage distribution of the word 'qokeey' in the stars section, and on pp. 58r and 58v.