Instructions
Plug your Action Replay device into your computer with the included USB cable. Launch the Action Replay Code Manager software you use to load codes onto your device.
Click on the games that you want to switch out for the U.S. versions in the "My Codelists" section of the window. When a game title is highlighted, click the "Delete" button to remove it from the codelist. Repeat for all of the European titles you have saved to the device.
Click "+" next to the "Official USA Action Replay Codelist" option in the "Subscriptions" section of the software window. This will open up a list of all of the U.S. games and their codes.
Scroll through the list of games to find the American equivalents to the European codes you deleted earlier. When you find a game with the codes you are looking for, drag-and-drop it from the "Official U.S.A. Action Replay Codelist" to the "My Codelists" section on the left side of the screen.
Continue moving the game titles until you have replaced all of the European codes. When you are finished, click the "Commit Changes" button above the "My Codelists" section on the left side of the window to save the U.S. game cheats to your Action Replay device.