Is there a difference between .NET 2 and .NET 4 assemblies running under .NET 4

I support the .NET 2.0 library, and recently, users have started asking for the version of .NET 4.

I could just duplicate an existing project in Visual Studio, install Target Frameworkin .NET Framework 4.0and do with it, but is there a difference between the .NET 2 and .NET 4 assemblies running under .NET 4?

I mean, will it change anything if I just rebuild the same source code for .NET 4? Is it expected that I will have a unit test suite for .NET 2 and .NET 4?

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.Net Framework , .Net framework 2.0 .Net framework 4.0. , .Net framework 4.0, .

, .Net 2.0 4.0, , : Visual # 2010 Breaking Changes

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