Generally yes. It's useful and they are usually derivatives of passenger models that obviously have it. A few models that were specifically designed to be carg

Generally yes. It's useful and they are usually derivatives of passenger models that obviously have it. A few models that were specifically designed to be cargo aircraft for use cases that don't need it are not and thus e.g. need barriers to the crew compartment that can keep that pressurized, have only limited ability to temperature-control the cargo space or would need extra heaters for this (pressurized aircraft get it almost for free since they use heated compressed air from the engines), are limited in what cargo is suitable, ... A well-known example is the Airbus Beluga: large chunks of metal don't care about pressurization.