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You had the ability to execute calculation scripts not business rules in the traditional (on-premise) FDMEE. If by Data Management you are referring to the Cloud implementation that supports the same but with Business rules not Calculation scripts. The only other difference is that Cloud does not support the passing of dynamic subvars or Runtime Prompts for Business Rules
Just to add you can only run the business rules after the DM data load in the cloud, have a read of https://john-goodwin.blogspot.com/2018/06/data-management-now-supports-executing.html
Also from the docs - "Business rules are executed only when you select the data load method as "all data type". They are not executed for numeric data only."