Found this online:
As a mass-produced device, I would expect there to be some variation between displays (especially the iPad 2 where there are multiple sources for the display) but your iPad 2 is probably too blue.
We have an ipad2 and ipad3 at work for development and side by side you can't see any color shift. If blue was that strong on the ipad2 it would be noticeable. Both displays looked very good in the color temp department.