Just in case you weren't aware there's already an XBC asset listed on coinmarketcap (Bitcoin Plus) but that hasn't stopped some projects having the same ticker as others although it may be preferable to use a unique one to save any confusion
If Xbrick doesn't have a plan of not getting listed on the coinmarketcap, there is no need to change their ticker and it wouldn't matter if they have the same ticker name with other coins. But if they plan to get listed, we can expect them to replace their ticker before they hit the coinmarketcap to avoid confusion.