This Batman doesn't really have any skill feats and was both already physically weakened and in a bad state of mind. Cap has held his own against actual Iron-Man (because this Bat is clearly meant to be Iron-Man like) and with Bucky's help beat him. He's tactically superior to this Batman, has better feats all around, and would easily be able to realize that he needed to cut Bane's Venom tubes, after which he'd destroy him.
Bruce was fighting like an idiot there. All Cap needs to do is sever the venom tubes with a well-placed shield throw, and then he should be able to take it with low to mid diff. Mjolnor Cap would stomp.