The extra versions of the logos were created from the original sized logo. The extras are just resized to 25-110 percent. If you want to replace your logo delete the extras and the game will recreate them next time you start the game. You can use different logos to replace these logos especially if they are loosing too much detail or you want to further customize. Check out this post for more info.
Can someone please detail where each different size logo is used in the game?