APIM 200 is default support for APIM Analytics 2.0.0. APIM analytics is also a DAS server with Additional APIM analytics features. But in your environment DAS already exists, you no need to setup APIM analytics and you can use the existing DAS server. But when you use DAS 3.1.0, you need to install additional APIM features. Also, note that APIM 2.0.0 only support DAS 3.1.x onward.
Refer this for more about features installation
Feature install DAS 3.1.0 is now compatible with APIM 2.0.0 analytics. Then configure APIM for Analytics and as appropriate for DAS For more about configure analytics refer to this doc.