People often refer to those "Classic" model 70s as Pre-64s-style actions, which is just a reference to the control feed action. One of the major reasons the pre-64's are sought after is because of the control feed action. In 1964, in a cost saving measure they switched them to a push feed action. They made other cost saving measures in 1964 as well with stock checkering, etc.
I'll be honest, I don't know much about the post 64 70,s because I don't own any. But at some point they started selling "Classic" Model 70s, which went back to using the pre-64 style action, which is what people marketing them are referring to. But a pre-64 "style" action is not the same thing as an actual pre-64 action (with a serial number before 581471) from a value standpoint.
I will say as a collector that's often searching for pre-64's it's super annoying when people list current production or more recent production Model 70s as pre-64, because it has the pre-64 STYLE action. Not the same thing...
From what I hear, the current production Model 70s are very well made control feed actions. While the "Classics" were introduced in the 90's as a control-feed option, I believe all current production 70's are control-feed.
The importance of that is certainly a long contested debate not worth getting into. I think most people think for a non-dangerous game situation, the benefit of control-feed over push feed is not really relevant. To each their own...