Here's a novel idea- instead of asking and waiting for a plethora of smartassed answers here you could just go to the Sidi website and get the answer right away. And I am sure that I won't be the only one to tell you that if you can't tell the difference between road shoes and mountain bike shoes you don't need a pair of $450 cycling shoes!
(and what is RBing?)
Did that.
They seem identical except for the added features of the Dragon.
But only someone who's actually ridden with both could tell what if any difference from experience.
And RBing road biking.
RB=road bike
ing=ing
And guess what...the smart arsed answers are going to come no matter what.
Hopefully, people who don't have any interest in contributing to the thread will
resist the temptation to leave a smart arsed answer and move on.