Says differently here
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The Type 054A frigate series currently consists of six production batches, with the sixth batch currently in production.
Beginning with the fifth production batch, these frigates gained the capability to support the takeoff and landing operations of Z-20J/F shipborne helicopters. The earlier batches—from the first to the fourth—do not possess this capability; they are only equipped to support the Z-9 series of shipborne helicopters. ------ The fifth production batch of Type 054A frigates is also referred to as the Type 054AG.
The Type 054A/P frigates operated by the Pakistan Navy are based on the core technology of the third and fourth production batches of China’s Type 054A frigates, but have been extensively customized to meet the specific requirements of the Pakistani Navy. It does not directly support the take-off and landing operations of the Z-20J/F shipborne helicopter.
Should the Pakistan Navy have such a requirement, these Type 054A/P frigates would need to return to a Chinese shipyard for refitting.
In reality, such a modification is virtually impossible. The rotor diameter of the Z-20J/F shipborne helicopter is nearly 4 meters larger than that of the Z-9 series, and its airframe is also significantly taller. This means that for earlier versions of the Type 054A frigate, it would be necessary to modify the hangar, expand the flight deck, and replace the landing/recovery system. This would amount to a massive, invasive overhaul—essentially gutting the entire warship. ------It's better to just buy a new one.