Hi Paula,
I believe you are referring to LiveCycle Designer and the differences between it and LiveCycle Designer ES. If that is the case, the short answer is "they are the same".
LiveCycle Designer is a tool for template creation whereas LiveCycle ES is a suite of J2EE-based solution services.
LiveCycle Designer ships with Acrobat, as you pointed out. It is also available as a stand-alone product. Either way it is a stand-alone executable. LiveCycle ES ships with LiveCycle Designer ES. It runs as an Eclipse plug-in in the context of LiveCycle Workbench ES. The other piece of Workbench ES is the tool for creating process orchestrations.
Steve