Isn't 093b has more powerful sonar that can detect opponents's subs?
It does seems to carry more sonars . The additional side sonar and the towed array from the small hump
Original Type 093 have flank sonars that is the flat conformal type. Both appear as square patches in the hull. Even Han class has flank sonars refitted. The location are indicated by white bars in the hull, which is a warning to the tugs not to tug in that part of the sub.
The newer 093A has these linear flank arrays instead as you can see compared to the previous model.
Han class. Note the flank array markers in white.
039B has this long linear array at the bottom of the sub.
I am not sure if this is a TAS or a long linear flank array.
There is also a warning marker to indicate a flank sonar in this location.
There is a wake sensor on the nose too.