U2412M A00 (two) have yellowish whites compared to U2412M A03 whites

I recently purchase two extra 2412m monitors to go with my existing 2412m monitor, that I purchased 1 year ago. The whites on my original monitor were fantastic; not so much on my new monitors as both of them look more yellowish than white. As you can see from this diagnostic mode picture, the whites are very noticeably different. The new monitor is on the left (Rev A00), old monitor is on the right (Rev A03)

http://i.imgur.com/rvF69Et.jpg

I've tried resetting to factory settings, playing around with colour settings, both have correct drivers installed, and I've tried a multitude of different icc profiles from tftcentral. Nothing makes the white colour come close to matching, unless I make my old monitor look yellower... which frankly is dumb solution. I purchased the two extra monitors to replace two Samsung LCDs, because I knew the whites were so much better, and I assumed they would somewhat match. What else can I do to remedy this? Can they be returned/swapped? Any help is appreciated.