suspension combo

Ok, i have this delema that when ever i go into my g/f drive way i bottom the front of my car out... i have KYB AGX shocks and some tyle of lowering springs ... i believe sportline... but my brother has he stock shocks and the RK sport coil overs , the adjustable ones, and when hes driving around the city he was them were there is the most amount of ground clearence and when he is racing he lowers them... i want to know if i can keep my shocks and add the rk sport coilovers to them and they will still work?