They are definitely not the same. The LED ACD uses an H-IPS panel - a high quality panel. The MBP (and most all notebooks) uses a cheaper TN (6-bit) panel that uses dithering. The newest iMacs boast IPS panels, an improvement over previous generations, but not the "same" as the LED ACD.
Comparing my unibody 13" MBP with my LED ACD, it's obvious the MBP's display is warmer than the LED ACD.
If you want consistent color reproduction you will probably have to carefully calibrate each display with a colorimeter.
Even the same model LCD displays can exhibit minor inconsistencies between each other.