To clarify my previous post. Would HQ-22 be more similar in role to the PAC-2 (optimized to engage aircraft at mid to long range) while HQ-16 would be more like PAC-3?
HQ-16 is more ESSM or CAMM-ER range (a little longer ranged but larger). The HQ-16 is nothing like a PAC-3. Some HQ-9 variant would be a closer PAC-3 equivalent.
HQ-22 is ranged between HQ-16 and HQ-9. It is developed from the KS-1 or HQ-12 (which is itself a modernised KS-1) but these were all programs in the 1980s onwards to develop a S-300 equivalent which would take upgrades over the decades. HQ-22 is basically a modernised HQ-12.
The PLA never bothered to really induct the KS-1 or HQ-12 because the HQ-16 and HQ-9 combination were far superior. They have adopted and even exported HQ-22 (to Serbia iirc) nowadays because it appears the missile shows some commonality with HQ-9 and HQ-16 parts (missile itself, truck, launcher, command modules, sensors etc) and it covers the 70km< range< 200km between HQ-16A and HQ-9. HQ-9A/B go beyond 200km.
These are versatile missiles though. They are not dedicated ballistic missile interceptors. For those, PLA's ABMs are known as HQ-19, HQ-26, and HQ-29.
HQ-22 does however have similar range to the PACs and is hot, slant launched.