I think the 12 not found with any other back but Nadja are many of the common players from both StL teams (poses are from E90-1) and even a couple are found with blue backgrounds (missing yellow ink) or green backgrounds (variations). I dont have my books so this is from shaky memory
PS just looked it up... this is what I have written on my site....
"The checklist is similar to other E92 sets except Nadja includes a group of St. Louis AL and NL players not found in the other sets."