I can’t say for certain but if your offer is BBB and you get AAC/A*AC you’ll probably be fine. UCAS points also matter. The entry requirements for my course are A*AA, I got A*A*B in my a-levels and still got an offer, however it might be different because I already had my grades when I applied (gap year).
As long as you get the same in terms of points you should be okay, but don’t take my word for it. In fact AAC is actually more ucas points than BBB so I’m sure you’ll be fine with that