No, unfortunately, you can't trade across video formats. However, Japan and North America are on NTSC, whereas Europe and Oceana are on PAL.
If you have an NTSC game save with the Diablo in it, you can simply buy it into another save at cost (1 million cr or so). That's how I got mine: someone mailed me a memcard with the car on it, and I traded it into my garage and mailed it back.