Unity 5 Standard shader to legacy shader

Hi,

I have a Unity 4.3 project which uses hundreds of 3D models. Now we are upgrading it to Unity 5. With that its replacing all the shaders as Standard which makes them look different and darker to the previous we had. To get the same look we need to replace the Standard shader with the Legacy shaders they had.

In Unity 5 Is there a way to know the legacy shader it had earlier. Since we are loading the models dynamically, we don't know which shaders they had in Unity 4. Is there a way to read it programatically in Unity 5 or is there a mapping to Standar to Legacy shaders?

Thanks