The boss itself doesn't change at all but you get some additional dialogue I think the first 2 times you retry on a repeat playthrough.
It's really not worh fussing over and I'm pretty sure you only can get it AFTER you've beaten Chapter 3. So if you're enjoying the challenge then just keep up the grind.
^ Hey now that's completely unfair!
http://i.imgur.com/yPw05Ob.png