Any good shop will be able to color match to factory level for you. I say factory level b/c the same color will always look different depending on the substrate (i.e metal fender vs. plastic bumper). Check yours now closely and you'll see it... same as on any new car too.
That being said, I had the front bumper on my '99 Arena Red Metallic resprayed 2 yrs ago and the shop (who does body work for the local Porsche dealer) matched it perfectly.
Sorry to hear about your need for a body shop but Good luck
