THE PLTS OF A BELL P-63 (KING COBRA), N62822 & A NORTH AMERICAN P-51 (MUSTANG), N65206, WERE PARTICIPATING IN AN AIR- SHOW WHEN THE ACFT COLLIDED DURING LANDING. AN INVESTIGATION REVEALED THE P-63 PLT HAD MADE A 360 OVERHEAD PATTERN BEFORE LANDING. AT ABOUT THE SAME TIME, THE AIRSHOW CONTROLLER SAW THE P-51 ON A LONG FINAL APCH & INSTRUCTED THE P-63 PLT TO ROLL OUT TO THE END OF THE RWY AS ALL OTHER ACFT WERE DOING. ACCORDING TO THE P-51 PLT, THE P-63 LANDED ON THE L SIDE OF THE RWY & HE ASSUMED THE P-63 PLT WOULD STAY ON THE L SIDE PER THE PREFLT BRIEFING, BUT HE RADIOED TWICE FOR THE P-63 PLT NOT TO TURN RIGHT. THE P-63 PLT SAID HE LANDED ON THE RWY CENTERLINE & AT THE END OF HIS LANDING ROLL, HE TURNED RIGHT TOWARD A TAXI STRIP TO CLEAR THE RWY ASAP. ALSO HE SAID HE DID NOT HEAR THE RADIO CALLS ABOUT ROLLING TO THE END OF THE RWY OR NOT TO TURN RIGHT. AN AIRBORNE PLT SAID THE P-63 WAS ROLLING ON THE L SIDE WHEN THE P-51 LANDED WITH A SAFE INTERVAL, BUT THE P-63 MADE AN ABRUPT R TURN. THE P-51'S R WING TIP HIT THE P-63'S RUDDER.