Colour Card Image Matching

Hi,
I have a series of photographs taken with colourcards next to the content. The colourcards are dark grey, mid grey and white.
The photographs have been taken with exactly the same setup although when I use the eye dropper tool in PS the values of the colours are slightly different. I suspect that light might be bouncing off different things in different images, the minor differences aren't that surprising. However, I need to make the colour card RGB values in all images exactly the same, and automate the process as there are hundreds of images.
Can anyone help with a workflow? I can't get my mind around how to apply the settings to all images so that the RGB values come out exactly the same for the colourcards every time.
Many thanks in advance.

station_two wrote:
jacktorrance wrote:
Thanks for your reply.
…how to achieve the results in PS alone, even if it means purchasing a plugin to make it easier…
Curvemeister is a plug-in.
For details, ask at their website.
I'm not sure how I could've made it clearer in my response above, other than to state 'I know that Curvemeister is a plugin', that I know that Curvmeister is a plugin.
If you read my message back you'll understand that the word plugin in my third sentence refers to Curvemeister.
Thanks for taking the time to point that out though.

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