I don't think he would. Punches were getting through, Golovkin doesn't move his head. The problem for Brook was his shots didn't hurt Golovkin, he isn't a middleweight. Eubank has more power and would land. Whether he can be slippery enough to avoid Golovkins big punches is another question, but...
Id love to see Golovkin v Eubank. I don't understand why Eubank didn't take the fight, was there an official reason? But after watching Brook, I think Eubanks style and punching ability would hurt Golovkin.