What is the difference between these two Rollmaster timing chain sets, other than the CS4065 has "gold" chain links? Is there anything wrong with CS4060? Mine is still in the box.

Well, I think I found the answer to my first question. The CS4060 Red Series is made of "standard" billet, whereas the Gold Series is made of "premium" billet and the gears are nitrited. The gold series specifically mentions Iwis chain, but both chains are German-made. 

One would conclude that the Gold Series is a superior product, but the Red Series must be superior to OEM.