Pernickety, Persnickety

Sometimes a word just sounds like what it means. Pernickety, or persnickety, seems like one of those words. It means to be fussy about small unimportant details.
 
Pernickety, from pernicky, is a Scottish word of unknown origin.
 
The Online Etymological Dictionary suggests that pernickety may be related to Dutch fijnkens (precisely, exactly) or to the English word finikin (dainty, precise in trifles) from the 1660s. Finikin is the origin of the word finicky.
 
Pernickety first appears in English in 1808. Persnickety, the American version of pernickety, appears in 1889.
 
What’s the difference between pernickety and persnickety? Just an ‘s’. Sounds pretty pernickety or finicky to me.
 
Reference: Online Etymological Dictionary, https://www.etymonline.com/
​