I must share with you an amazing website I have just come across:
which contains Chopin’s mnuscripts and shows variants among first editions.
What a tremendous resource, kudos to the authors, editors, designers and investors!
I read about this at the British Library last month in
“Interpreter Chopin, actes du colloque, 25 Mai 2005”, organised by Eigeldinger, in the chapter by John Rink entitled Chopin: Work in Progress. Great job!