That question deals with one of the commercially released Vera Blanc games, and not one of my fan made games.
The 'spot the differences' mini-games change each time you play. One way to find the differences is to take a screen shot, then print it out. Cut it in half, then place one side over the other and hold it up to a bright light.
Solving the 'spot the differences' is not critical to finding the best endings in the commercially released games. I'm sure Winterwolves Games appreciates you buying Vera Blanc and the Ghost in the Castle. You probably should ask for help at the Winterwolves Games forum. Here's the link.http://www.winterwolves.net/
Back on topic.
I did not include any 'spot the differences' mini-games in my fan made games.