Cant match factory exterior Yellow?

[YetiWalker]

Hope someone can shed some light on my problem. I had a little accident and needed to have the drivers front fender repaired and turn signal replaced. The shop used the paint code found in the glove box but the fender is a different color than the rest of the truck. Not just a little off but a lot! The new yellow looks completely different. The shop keeps ordering paint using the same code and keep getting the same but wrong paint. Is there another place on the vehicle for another paint decal? Are there different yellows of '03 H2's? The shop is at a loss and I'm losing my faith in them but they are the only body shop for 150 miles. Any help would be appreciated.
PS: the accident was while hunting...and i got skunked there too...not a good day