Hi! It doesn't matter which emissive ores resource pack I use, the iron and copper ores are very similar in color. This doesn't happen with other shaders, like Complimentary Reimagined.
Is there a way to fix it?

I understand the issue. It has to do with how bright the emissive objects are and the shader's lighting model.

I won't change the lighting model, but in the next version, a tone-mapping selector will be added, which might help reduce the issue. It won't be very soon.