What were the two similar and the two different factors between the crisis in the 1st century BCE that undermined the Roman Republic and the crisis in the 3rd century CE that undermined the Principate?Describe

 Roman Republic and the crisis in the 3rd century CE

What were the two similar and the two different factors between the crisis in the 1st century BCE that undermined the Roman Republic and the crisis in the 3rd century CE that undermined the Principate?Describe