So what's your silly question? This is a sensible one.
Surrounds that are too different in sound from the main speakers will sound out-of-place (and, in particular, stand out more than surrounds ought to). There's a tendency among manufacturers to give all of their speakers a similar timbre. That's partly by design, because they know HT customers will want to mix and match, and partly just a function of the fact that whoever designs their speakers aims for a certain sound.
There's a good chance that the speakers you have in mind will sound fine together. That said, you cannot count on it happening. The only way to be sure is to take a pair of the surrounds home on trial (or with a money-back guarantee from the dealer), and see how they sound in your system. (Note: It is always important to try speakers out in your room, since speaker-room interaction matters a lot.)
Surrounds that are too different in sound from the main speakers will sound out-of-place (and, in particular, stand out more than surrounds ought to). There's a tendency among manufacturers to give all of their speakers a similar timbre. That's partly by design, because they know HT customers will want to mix and match, and partly just a function of the fact that whoever designs their speakers aims for a certain sound.
There's a good chance that the speakers you have in mind will sound fine together. That said, you cannot count on it happening. The only way to be sure is to take a pair of the surrounds home on trial (or with a money-back guarantee from the dealer), and see how they sound in your system. (Note: It is always important to try speakers out in your room, since speaker-room interaction matters a lot.)