the second picture,that one moves on the runway carries PL-12, but it is not J-11B because it not with black radome, I think many J-11A already have up graded.
Its material science and quality control that seems to be the main bottle necks of Chinese engine design. Unless they also get full ToT, getting a few AL41s to look at won't change things much.
What more, the Chinese seem to be aiming for western standards with their engines if you look at the lifespan and reliability figures of the WS10A v AL31.
That means even if there are major technical breakthroughs on the AL41 that could benefit Chinese engine design AND they got full ToT, materials and QC may still be the bottle necks if the engines are not giving the lifespan and reliability levels the PLAAF demands.