Reader uses the exact same color management as Acrobat, so no worries there.
As regards color differences XDP+ vs. Reader. Without downloading the trial (or taking Bhav up on the offer to test the color management), I don't know what/why there is a change.
There are a couple possibilities as to how, or if, the pdf is including the profile. If a at the document level, then Acrobat/Reader will display using that profile. But if XDP+ is tagging elements and not embedding the profile at the document level, then one has to make sure the Output Preview panel is open AND that the correct output profile is displayed in the Simulation Profile drop down--which is something Reader does not do.
As for the initial set of screen shots, I get the exact same color representation with cmyk vector objects no matter the document cmyk color profile in Illustrator...else it is so subtle I cannot see a difference.
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