Cherry MX Browns and Blues are certainly quite different with respect to e.g. tactility. It's not just the noise. That having been said, all cherry switches have some common features, and there's a whole world of non-Cherry switches out there, with much greater variety.
To get an idea of the differences between different Cherry switches, have a look at these force curves for Cherry MX Brown, Blue, Black, Red and Clear:
Not that these types of switches are bad (I quite like some MX style switches), but as you can tell from the above graphs, all the Cherry MX switches follow a similar pattern. They're either linear or have small, rounded tactile bumps superimposed on a linearly increasing force curve.
Assuming that things haven't changed in the last couple of years, Outemu hotswap sockets only accept Outemu switches, because their pins are so thin. You'd have to modify other MX style switches to fit the Outemu sockets.
Hope you don't mind me asking, but why did you go for this keyboard?
It does of course look fun, but also seems like it would be horribly uncomfortable to type on.
If it turns out that you like mechanical keyboards, I'll bet you a dollar that you'll be coming back for something better
EDIT: Just to give you a taste of the possible variety within clicky switches, here are a couple of YouTube videos you may find fun:
TOP 5 CLICKY mechanical keyboard switches of all time
Model F77, IBM Model M, and Cherry MX Blue sound comparison