TSF Collector's Quiz - n.º 2

The souvenir sheet of Canadian Locomotives (1860-1905) issued for the National Philatelic Exhibition in Montreal has a background of its stamps printed in blue-grey as opposed to the sheet stamps with their background of green-grey. The sheet itself has a number of known varieties and shades. Below are two examples, the first the 'regular' issue and the second with a number of noticeable variants.

How many differences can you spot?

Scott n.º 1039a - Canadian Locomotives (1860-1905)

Scott n.º 1039a - Canadian Locomotives (1860-1905)

Happy collecting hunting!

P.S. One of the noted differences is not the tagging error - Scott n.º 1039v