Obviously. There are tennis players who tinker/fine tune with their racquets or have them customized so they feel similar to another racquet. Then there are others who just play stock with whatever. Then there are some pro's who through play testing and data have a racquet company fine tune something specifically for them.
Head Extreme IG Pro: Klip 18g Gut Mains at 54 & Prince Beast XP at 50
Head Extreme Microgel MP: Lux Adrenaline at 56