Here's a quick little tutorial on how to use a US save work for a European save and vice versa.
A North American save name looks like this:
To make it a European save right click on the save and rename it by changing the NA to EU:
The put the save in either Horizon or Modio and click on file contents. You should see a file with this name again:
Do the same thing as before rename it to say EU instead of NA. Then rehash and resign.
To transfer from an European save to a North American save simply do the opposite of the instructions I just gave.