What are the postgis-3 other postgis_*-3 extensions?

Question

The PostGIS Installation instructions show using CREATE EXTENSION to create PostGIS and several related extensions (see below).

After recently installing PostgreSQL 14.6 on Ubuntu,¹ I went to create these extensions. When I look at the available extensions, all of the extensions listed below except for fyzzystrmatch appear as shown and as postgis-3, postgis_raster-3, etc. The available version numbers are the same for all of them, leading me to believe that they are just aliases, but I can't find any information about them in the documentation.

What are the postgis_*-3 extensions? Is there any difference between them and the "base" extensions, and is there a reason to prefer either one?

CREATE EXTENSION postgis;
CREATE EXTENSION postgis_raster;
CREATE EXTENSION postgis_sfcgal;
CREATE EXTENSION fuzzystrmatch; --needed for postgis_tiger_geocoder
--optional used by postgis_tiger_geocoder, or can be used standalone
CREATE EXTENSION address_standardizer;
CREATE EXTENSION address_standardizer_data_us;
CREATE EXTENSION postgis_tiger_geocoder;
CREATE EXTENSION postgis_topology;

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¹ Actually done by a colleague.