Well, looking at their stats, both pitched around 200 innings with an ERA+ of about 122. So stat-wise, it makes total sense for them to be the same. Felix gave up 3 less hits, and 10 less walks over 4 more innings pitched.
So was he better? Yeah, he was. But not by a tremendous margin.
Conclusion: Felix didn't have his best year, and a 2nd year player had a pretty good year (let's not forget that the White Sox sucked this year, which would explain his only having 9 wins)