Given that Hudong Zhonghua is the lead shipyard for the Type 054A, chances are it will be the lead shipyard for the 054B. If there are any Type 054A modules still left with HDZ as the steel for the 054B has begun cutting, these will still be finished until all the modules are consumed. But at this point, they would have stopped building new 054A modules.
Guandong Huangpu will take a bit more time before its validation to build 054B.
I believe both shipyards have kits for four frigates --- two 054A/P and two 054A for HDZ and four 054A for GH. I expect one more Type 054A to come out from HDZ along with the final 054A/P, and three more 054A from GH, aside from those already launched. This before we begin to see any physical signs of 054B in the docks. I guess next year.
I also expect the sale of the HDZ facilities at the Huangpu River to be indefinitely postponed for this project. Future 075/076 will have to be made in the Changxing facility.