I've done this "experiment" unintentionally a few times where I've kegged a beer (I always purge keg full of sanitizer by pushing with CO2). Then after a few weeks carbing/conditioning I start serving the keg and also Beer Gun bottle a few for competition or archiving (purging the bottles as well).
In several cases, I've kept the keg and bottle cold for up to 9 months and tried both. Without fail, the bottles will start showing some faint signs of oxidation and the keg does not.
I most recently did this just a few weeks ago with a Marzen that I brewed last fall. What's funny is when I drank the bottle it actually tasted like some of the Spaten Oktoberfest I had a few years back. First time I recognized the caramelly sweetness I had experienced in that beer was not intentional
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