Reflection: Load multiple assemblies

I have two assemblies (one dependent on another) that need to be loaded dynamically. I also have a certain version of the two assemblies referenced in the project, but a different version than this version should be executed depending on the assemblies loaded. How can I make sure that the executed code comes from the dynamically loaded assemblies and not from the static references in the project?

Here's some pseudo-code of what I'm trying to do:

Assembly assembly1 = Assembly.LoadFile( @"c:\assembly1.dll" );
Assembly assembly2 = Assembly.LoadFile( @"c:\assembly2.dll" );
Assembly2Type a2 = (Assembly2Type)assembly1.CreateInstance( "Assembly1TypeFullName" );

CreateInstance does seem to create the right type, but Assembly2Type seems to used the project-referenced version of the assembly instead of the dynamically loaded assembly.

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