Even though you say the color settings are the same, I would double check to be sure both the file and software are matched in the Color Settings. It's easy enough to manage in Bridge using Edit/Color Settings and ensuring they are synched. If you don't have Bridge installed, go to Edit/Color Settings in InDesign and Not only check the Setting, but the Conversion Options below. If that is different, it will convert your RGB to CMYK differently per user.
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