There are a couple of big differences. Redding recognizes that he will get hit, and will give up runs. But it as long as he is not fatigued or having an off-night control-wise, it doesn't stop him from going after guys. It is better to have guys beat you then to give away free passes. Redding isn't afraid to give up hits or runs. Bergmann, on the other hand, pitches out of fear of getting hit, and thus compounds his own problems with giving up too many walks and getting behind batters. The other thing is that Redding knows he is still one 9th of the batting order and helps himself with the bat. Bergmann is an inexcusable disgrace with the bat in his hand and makes the end of the lineup a complete joke that other teams can take to the bank to get out of an inning.
Redding is just as bad, just in other ways.
He gets beat by the bottom of the order far, far too often. He also rolls over with 2 outs in an inning way too frequently. He'll get 2 quick outs and then roll over like a dog.
Redding is one of the least resilient and least poised pitchers I've ever seen. Once things start to go awry for him he never can limit the damage.
