you or the body shop would have to be nuts to allow a blend for a front bumper repaint.
I saw your other post and thats not a blending problem but a hack body shop that i would't go back too. Also I'd verify the kms if you drop it off again because the only plausible explanation for that paint job is that they wanted to re-test drive your car.
Thats a horrible paint job. I know my local body shop has a paint scanner that matches paint 85-95%. Get to a better shop.
UNDER NO CIRCUMSTANCES would i allow them to blend !