It’s possible, but it’s also possible the counties flipped because of changes in turnout.
Democrats, Don’t Waste Your Time With Trump Supporters
Nicholas Grossman
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Indeed, during Trump’s last few weeks the focus was on voter suppression against possible HRC voters, rather than just voter turnout for Trump supporters. All of the groups targeted were strong Obama supporters in past years.

“We have three major voter suppression operations under way,” says a senior [Trump] official. They’re aimed at three groups Clinton needs to win overwhelmingly: idealistic white liberals, young women, and African Americans.”

Source: https://www.bloomberg.com/news/articles/2016-10-27/inside-the-trump-bunker-with-12-days-to-go