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[40k] Difference in Imperial Guard fire power

How does the Imperium deal with the massive difference in quality and available firepower of their Guard regiments? Say planet A is a backwater world operating at around Medieval levels of technology, how would the Imperium ensure guard they recieve are pitted against an appropriate enemy? Do they bother? Are you essentially screwed if you are from a low tech world?
gpt
Each Imperial Guard unit receives their equipment from the Departmento Munitorum. Imperial Guard units such as the Attilan Rough Riders hail from a Feudal world, are in fact much sought after across the Imperium for their maneuverability as a heavy patrol unit and able to operate behind enemy lines with little support. 

Imperial Guard training differs across each world. Some Hiveworlds round up their worst recidivists and simply throw them into regiments. Others, such as Feral and Feudal Worlders, would already have more combat experience than the average Imperial citizen and therefore require only minimal training to use more advanced equipment during the long haul in-between battlefields.