Exception to the Duplication Rule
After a display is duplicated, the original and duplicated item become independent of one another, where modifications to one do not affect the other. However, there is one exception to this rule.
If you create a form that points to an external .NET assembly file (created in another tool, such as Visual Studio), and then duplicate that form, both forms contain a reference to that assembly file. If you then upload a new version of that assembly file in the original form, then when the duplicate form is opened, the new version of the assembly file is also loaded for it
However, this behavior is not specific to duplication. If you create two independent forms that use the same .NET assembly, and a new version of the assembly is uploaded to one of the forms, both forms will use the new version. Only the most recent version of the .NET assemblies are saved.