A few interesting facts: the creators of the woodcut used the surname Winter rather than Wintour for Robert and Thomas — the artist appears to have been a bit loose with spelling.
Also, there are a couple of conspirators missing from the picture.
Lastly, Thomas Bates, who was the only working class member of the group — he was Robert Catesby's servant — doesn't appear to have been considered important enough to be given a first name.