I would not go with the same color as the car for one main reason, you are probably not going to be able to find HIGH temp paint that is close enough to the color of your car, and if it is not really close it is going to look cheap..
I painted mine silver, and am very happy with the "clean" look that it gives.
Just my opinion for what it is worth..
As far as the license plate goes, can't help you, don't know which one is old, and which one is new ( US ) if I had to choose I like the white one better...
Happy Motoring !!!!
DMP