ACR 5.5 vs ACR 6.3 LAB values differ!

Hi,
My work requires me to run sampling of LAB values on images. I used to work on CS4 ACR 5.5 and now CS5.1 ACR 6.3.
However, i realize the same RAW image with the exact same setting .XMP was appearing different in both platform!
ie. the LAB values of Yellow in my image in CS4 ACR 5.5 is slightly different from CS5.1 ACR 6.3...
i am hoping to resolve the difference and hope the results can be aligned by understanding such discrepancies! Thank you so much!
regards,
ryan

Hi,
I took an image in RAW and open the same file in 2 different computer. One is window base, CS4, ACR5.5 and another one is MacBook CS5.1, ACR6.3. Then i open the file under As Shot setting, presumably both will be the same. However, the RGB, LAB values all appear different in both side.
I'm actually not sure where the difference is in, Photoshop or ACR...
I have ensured that the "EDIT", "Color Settings" is the same for both computers. Basically i aligned both computers under "North America General Purpose 2", just to testing sake, and yet both still appears different.
Then i ensured that under "Preference", "Camera RAW" is the same also. But yet still its different.
Is there any other settings that i missed out?
The way i can tell the difference is that after i open the RAW image, i will take a sampling of the LAB on the same spot on both computer.
regards.

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