I think I looked at a late model D plans and made the conclusion from that.
Based on source (gotta love the Russians, they argue as much as Americans do!) the final variant was called either a T, U, or P depending on time and place.
Latest info I had was the ones in Korea were re-dubbed Ps (as noted for "perekhvatchik" or interceptor) to apparently make the DPRK think they were better! (Chinese got La-9/11 aircraft and MiG-9s, but realized the MiGs were no good against US aircraft and howled for 15s.)
Cookie Sewell AMPS