You can connect to the mobile network using many bands, for example from 700 MHz or 3.6 GHz. Does this matter?
Yes: basic 5G (5G NSA) uses the 4G computing system and is the most widely deployed. Advanced 5G (5G SA) has its own computer network.
Multiple factors influence download speed, including frequency band and the distance from the base station. But consistent availability may be as important as speed.