I've been thinking about it as well. It's hard to compare because I don't think the O's have anyone like Pena or Hellweg in the system. They have Bundy and Gausman, but they are much better prospects than the pair the Brewers got. I think the Orioles would have been forced give up quantity over quality but I'm not sure that's what the Brewers were looking for.
Probably would have been something like Parker Bridwell, Nick Delmonico, Jonathan Schoop, and a Mike Wright/Eduardo Rodriguez -- and maybe even a bit more.
Don knows more about the trio the Brewers received but from what I've read and learned about those prospects, what I posted above seems like a fairly equivalent package.