Both "Malù e l'amante" (1991) and "Lady Chatterley Story" (1989) are often mistaken as the same movie, but they are different movies, with different directors (even though both have very similar plotlines).
It is unknown what year exactly this movie was made. The Italian DVD cover says it's from 1990; some Italian books and websites say it's from 1989, while others say it's from 1990 or 1991.