Hello friend.
Well you have to check for sure if the CUSA number is the same.
I did all the saves with the digital version.
I'm from Europe but keep in mind that the game in Europe has 2-3 different regions.
So if you have another CUSA code you need to re-sign the save.
EDIT:
I checked and for Europe there are 3 different CUSA on retail version:
06164, 08974, 08975.
If you have one of the first 2, you need to re-sign my save.