Flutes on a barrel are usually the term for the outside of the barrel.
Lands and grooves are the transitional rifle barrel twisty you see.
Valleys and hills for the P7 cold hammer forged polygon bore barrel which are claimed to be tighter seal for better pressure while less build up, tearing of the copper jacket, dirtiness, and wear. Blah blah blah on if any of that is true.
Now you are saying the valleys and hills are reduced one to the other? One thing to consider, the age difference might be a manufacturing difference or even variation between barrel make?
A cold hammer forged polygon bore barrel probably isn't seeing a decrease from use for a long while, nor a conventional barrel. Unless you are saying you've shot the living crap out of the gun with 10xs of thousands of rounds?
Informative sight on barrel types. And you can see how "ballistics" can pull barrel patterns from a bullet:
https://www.firearmsid.com/A_bulletIDrifling.htm
The most accurate duty gun I've owned is multi PPQs which had traditional and then changed to poly rifling. No change what so ever in my hands.
P7s are a religion. I look forward to people giving you better information.