I think a CDM has greater scope than a clinical SAS programmer. The data manager is responsible for ensuring validity of every bit of collected data in a clinical trial, even before it is collected by virtue of specifying validation lists and edit checks, (and afterward).

Clinical programmers are generally responsible for only those particular tables, listings, and graphs that are assigned to them for a particular study, even then their scope is limited to the programming and validation of those TLFs – others usually design the TLFs in the specifications depending upon what they are trying to analyze for a particular submission or data request.