Well, OSX quickview /Finder, and Final cut pro show the two sample files with different colors for me. Also different from each other and Resolume. Hard to say what is original colors.
Try making the screenshot in the program you'll be using for the playback. PNG made in Resolume from the prores footage looks the same for me as the footage.
Even better, make a duplicate of your clip and have it paused on the specific frame.