Mike may be on to something with his question about color space. I suspect you are either using a conversion from a spot color, or you maybe don't have the vector version to start out (did you select elements in Illustrator to check or overprint, or just open the panel, by the way?) Your Darker version, which is dark even whne not on a background, probably menas it is not a case of overprint, but it does look suspicioulsy like a spot-to-process color conversion.
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