I too experience this (all the time). I’ve noticed in other 3D Apps (LightWave and Cinema) they have free texture libraries (Chrome, glass etc) which you can download that also don’t look the same when you apply them as they do on the sample supplied with them.
I “believe” this can be attributed to the size of your model. Keep in mind the environment you assign is what’s reflected on your surfaces. If the model is really large you’ll get different reactions than if it’s really small. There’s got to be a sweet spot (size).
I think it would help if Video Co-pilot offered some idea of what the perfect model size should be in relation to the environmental maps they supply to get as close a representation in the comp window as we all see in the preview.
A few test renders with a variety of different sizes might answer this question. If you discover something – please share.
Time is not linear but rather an eternal now.