I would like to report here the duplicates I found so far:
- the Nationalmuseum of Stockholm has two pages. Idem for the Smithonian (http://www.the-athenaeum.org/sources/detail.php?id=1594) and the National Gallery of Art, Washington.
- idem for Rembrandt van Rijn (one page has the complete collection of his works, the other a few dozen).
To be updated.