MAtch the motors and then the minor variations in the props will cause them to still operate at slightly different rpm...
The real goal is matching thrust.
It was proven long ago that having mismatched motors/engines on a twin wasn't all that big of an issue. Someone flew a glow power twin with a .40 on one side and .46 on the other. In fact when doing glow twins it is recommended to not even try to tune the engines identically... just tune each to run right.
With quads you'll be varying power to each prop in order to maneuver. Its unlikely for all 4 to be turning the same RPM at any time.