I've never understood the idea of never brewing the same thing twice; I don't know how one could ever improve that way. But maybe that's not the goal for such people.
Sometimes I think that those who never repeat a recipe are on a search for the holy grail; rather than refine their process and recipe to maybe find it, they keep searching here, there, everywhere.
Anyway, much of this depends on what your goals are. Is your goal to improve as a brewer? I don't know how you could do that if you didn't repeat recipes trying to improve the process. Is your goal to always have something different? I don't get that, but I suppose it's as legit a goal as any other--after all, you get to choose what makes you happy.
I've followed a process of continuous quality improvement as I've gone from a newbie to a brewer of some really good beer (not my evaluation, others'). It's simply this: every time you brew, try to do at least one thing better than last time. Control temps better, control fermentation better, make a better starter or rehydrate your yeast if dry, time your hop additions more accurately, bottle the beer better, do whatever.
So my suggestion is to be as honest as you can be about the two beers you've just brewed. Ask someone who will be brutally honest to assess them, and then try to discern where you can improve them. I make pretty good beer, maybe even excellent beer, but I'm always trying to make it better. Always.
Think about where you want to be with your brewing in six months, a year. If you want to be producing beer your friends want seconds and thirds on, that is celebrated, then work to refine what you do. If you want to make it impossible to isolate variables that affect the beer, brew a different recipe every time.
I'm with IslandLizard: brew the brown ale again.
Good luck, enjoy, and you do get to decide what your goals are--even if they're not the same as mine.