So j20 will still be the baseline or the next batch will be j20a/s while j20 is slowly phased outEven if you MLU the J-20s to J-20A standards by gutting and replacing their internal subsystems, you still wouldn't be able to implement the physical modifications seen on the J-20A airframe. So even if the PLAAF were interested in such a program, it wouldn't result in an aircraft that is 100% on par with the J-20A.