Can I build a home theater surround-sound systems with “unmatched” speakers?

I purchased a 5.1 Mirage Nanosat system that does not come with a dedicated center-channel speaker, just 5 identical sattelites; my brother-in-law has one, a B&W, that he says I can use. I’m a little ignorant about this and still learning, can I use the B&W and turn this into a 6.1 and have it sound, NORMAL? Will the speaker combination be compatible? Thanks for any advice you can provide!!!