144Hz can be enabled but I have not been able to get it working with HDR so far. Going to 144Hz forces the panel back to SDR.The PA32UCG and PG32UQX are literally the same panel. The off axis contrast enhancement is simply a layer of material inserted between the panel and backlight. It literally probably costs ASUS $20 to add this layer. This was basically an intentional gimping of the PG32UQX.
While the PA32UCG lacks gsync, it does support the absolute latest version of Freesync, which is actually quite good. It also supports HDMI 2.1 VRR which the PG32UQX lacks.
The PA32UCG also has a setting to enable 144hz, although ASUS does not advertise this.