Apple pd fast charge can be compatible with low-power Apple charging mode, like green Link pd fast charge can support up to 20 watts of charging power, but it also supports 15 watts of output power, so some of Apple's 20 watts fast charge can support 18 watts of charging speed, in each charging head identification place, You can see the power output of the charge in several modes.
If it is the original fast charge is no problem compatible, if it is a third party fast charge will not work, because the fast charge protocol is different.