There are only five copies of the print from 1782 extant worldwide in libraries in London, Paris, Chicago, St. Petersburg and Moscow.

I would like to thank the Newberry Library in Chicago for their kind permission
to use images from Paisiello’s Regole Per bene accompagnare il Partimento, printed in 1782 in St. Petersburg (US-Cn Case 7Q100).

Giovanni Paisiello, autograph Regole, title page
(I-Nc 18.3.3/18, olim Rari 3.4.17/1bis)

Most probably the autograph served as a guideline for the print of the Regole 1782.
There are few differences between the autograph and the print.
You can find more information on this in my book.