DuplicateRule is used to retrieve and deploy Duplicate Rules.
MatchingRule is used to retrieve and deploy Matching Rules.

Sample Package.xml:

<?xml version="1.0" encoding="UTF-8"?>  
<Package xmlns="http://soap.sforce.com/2006/04/metadata">    
	<types>  
		<members>Lead.Test_Duplicates_Rule</members>  
		<name>DuplicateRule</name>  
	</types>   
	<types>  
		<members>Lead.Test_Lead_Matching_Rule</members>  
		<name>MatchingRule</name>  
	</types>        
	<version>43.0</version>        
</Package>