better compare "Wystarczy być" {Being There?} and "Kariera Nikodema Dyzmy... "The Painted Bird" is another cup of tea
Yes, and this is what Polish Wikipedia says (my translation):
According to the opinion expressed in the magazine Village Voice in 1982, the book "Being there" was a plagiarism of the Polish novel "Career of Nicodemus Dyzma" by Tadeusz Dołęga-Mostowicz, unknown to the Western readers at that time. On the other hand, it should be noted that the psychological portraits of the main characters are quite different. Chauncey Gardiner is a simple, limited man who allowed himself to be passively carried by the circumstances. Dyzma, on the other hand, quickly develops the features of a cynical manipulator, actively creating the events and instrumentally treating people around him.
I have no personal opinion on the subject here, since I only read "Kariera Nikodema Dyzmy", long time ago.