I think, like others have said here, that seeing the car outside in the natural sunlight is the best way to go. I haven't seen the red outside yet but I wonder if it has any color shifting characteristics (like the dark blue color goes between blue and purple) that make it go from red to red with a slight orange tint? I had a similar issue trying to figure out what panther metal looked like in reality. All the pictures I saw made the color look almost black with a lot of flake in it but I recently saw a youtube video (I posted another thread on this) that showed that the paint wasn't as black as the other pics lead me to believe and was a color that I was more interested in now. Unfortunately it was still indoor light but the video was...well...a video and had more angles to look at the paint under the light than the still pic had.
The other thing I noticed with some pics and some video reviews is that (especially in really bright conditions) the photographers will add "filters" to their cameras which may make a particular color look darker and richer in bright conditions when in reality the color will look lighter. There's a motor week video from a while ago where I noticed this. The car was micro blue and in their video the color looked GREAT! Then I realized that ALL the colors of EVERTHING looked great in the bright conditions and then I realized they were using a filter on their camera.
Or, like you said, the colors could just be different in different countries.
Sorry to ramble on, just some things that I personally noticed.