Judging by his fight with Pascual, im not sure if Borboa had an iron chin, and Romero hit 100x harder than Quiroga. Pretty sure Romero by KO in a war.
I've just watched that one, as well as Romero vs Hipolito and Grey. I think Romero wins as well. Borboa wasn't hard to find, and I don't think he can take Romero's best. This is the sort of fight which you don't need to analyze much.
Romero vs Onizuka would be a good one too, but I'm fairly confident Romero KOs Onizuka as well. In the past, I've posted Romero vs Moon and Zamora. Romero gets stopped by both those guys, but they would be fun as Hell while they last.
I saw Borboa twice, the first fight with Grey, and when he beat the hell out of Roman' s little brother. If my memory is correct I thought he beat Grey. In any event I don't think he would beat Danny Romero. As an aside, Roman got the fight with Borboa by beating Scotty Olson. That was on the under card of the second Carbajal v Gonzalez fight and I was there that night, too. Olson was well ahead when he hurt his hand and stopped punching; at that I thought he probably should have won. Had Olson won, as was supposed to happen, he would have fought Borboa and I think that would have been a pretty entertaining fight.