I think if anything they just used the MP maps for SP and not the other way around. The campaign was more or less a tutorial of how to do things in the game so it's not that big of a deal to me. Maybe it wasn't as bad for me because I went from MP to SP and not the other way around. Which might explain my slight disappointment with the free map. I love the look of WW1 and WW2 maps, especially the European theater. They can give me those maps all day.