Best to bring a small piece of painted body to the paint shop (bracket or something maybe they can test colour from the truck if you bring it down).Some paint colours have about 10 variants so if you give them a paint code they can be off by a little . Found that out after I had the paint shop make up a spray can only to find out about the variants in the code for the colour.
I will second the recommendation for the above company. I have had good results ordering from them and matching paints. Recently I received a couple spray cans of paint from them and the color match was impeccable.