Trying to understand how to analyze diff European History

Trying to understand how to analyze different artists as well as styles and a major issue is between donatello and Michalangelo, specifically the following two images. what are the differences and similarities between the two and how would i best find out what the targets for the artwork were as well as what the intended message might be. Please help find all ways that this could be compared to each other in these ways!!!!

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