Match to the CAR, not what you have in the can, there are too many variable that determine the final outcome of the color.
Sometimes they(rarely) get a bang on match, but most times I just used it to get a blendable match, then tinting if necessary.
Yes, I can definitely see that your car is greener than the inner fender, I wouldnt blend the inner color into the car color, it would definitely need to be tinted closer to the cars color first.
What everyone is telling you about blending is spot on(no pun intended), there are too many variables that come into play when spraying that will affect final color, so mix a blendable match as close as you can get to the color that on your car, NOT in a can that you already have, and blend your basecoat into the adjacent panels and then clear the entire blend panels.