The Poco M4 Pro 5G has a dual-lens stock camera instead of the three that the M3 Pro 5G has. The stock camera app produces decent and attractive shots, but you should try the Pixel 6 camera app (GCam Mod) for a better experience if you’re not satisfied with that.
There is available an APK of the google camera; you just need to download and install that on your phone to use google camera; you’re not able to get that on the play store. However, the stock camera of this phone uses the sony camera lens, so it should be better.