Imac and photoshop coloring

i have 2011 imac , 2008 unibody macbook pro. graphic designer. when use photoshop on imac colors come out brighter , doesn't match on other machine. opened psd on unibody , colors way off. how correct colors on both machines?

 

as both machines use different panels, , different colour profiles, need colour correct both displays, either via eye in system preferences > displays > color > calibrate or via external device.

 

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