It's not only the various stamped parts, hollow roll pins, etc, that make post-64 Model 94's less desireable & less valuable than pre-64's.
During that change, Winchester also changed the way the receivers are made, switching from forged steel to a sintering process, that has a finish (on most models) that only looks like conventional bluing, but isn't.
They tend to show rust/pitting with only light handling/use - aka, as soon as you look at them.
The post-64 receivers were first plated, before they would take any additional finish(s), of which there were several: "blued", "color case hardened", black chrome, "Pewter", "Gold", "Silver", and Brass. (The last 5 finishes were mostly used on commemorative models)