IMHO if I was looking at the house from like 25ft away... I would not be able to tell the difference, and in all honesty... It looks like white/blue to be like a robins egg. Given the pictures close up... I'd ask for them to re match the paint... You probably have color codes from the original paint... I'd ask that they match that. If it's still a little off even after that I'd just drop it. The contractor should have shown you the paint vs the new paint on scrap to verify a match given the terms...