I think long distance is quite similar to the shorter distances
I cannot say this to the point I want to but NO. The energy systems are way different for something like a 100 compared to even a 400 which taps into the oxidative energy system. I will say that I have long distance runners run 400s in sub 1 minute but they never could approach the 400 specialists who were sub 50s.
Especially having ran everything from the 100m to 2mile/3000m. I wasn't great but I was decent for a hobbit. I could run a high 11s 100 yard (not meters hahah), low 50's 400 and a mile in just over 5 minutes. My 2mi best were above 11 minutes. I never timed anything longer but I have run 15-20+ miles for my short XC training in summer (before quitting. ankle sprains and dog attacks got old fast).
Apparently my post on this got deleted or didn't send. I can't remember.
Supposedly the Chinese are doing some sort of blood testing for their athletes for muscle fibers.
To reiterate, you basically have the type I slow twitch muscle fibers. You also have type IIa and type IIb. Type IIa can switch from type IIa to type I depending on needs. They aren't quite as fast as type IIb but they are nearly equal to them. They depend more on the glycolytic energy system than phosphagen/ATP. Some research has shown type IIb can or will change to type IIa. So, basically it's all dizzying.
You can also look into "Born to Run" which espouses that humans are basically built to run and one of the reasons we survived and dominated the food chain. Look into persistence hunting which we, dogs, and wolverines are known for. Basically running down other animals, especially those quick twitch freaks that gas out over time.
And as awesome as our greatest human athletes are in speed and jumping prowess, they still rank poorly in the animal kingdown. It seems that is true even for our most strongest and powerful athletes, even when roided up.
As to training for the longer distance runs, a lot of 100 and 200 runners will stay away from the 400. It is a horrible race quite possibly only equaled by the 800 whereas running the mile and longer or 200s and shorter are never really that hard. Take a look at which races make the most people throw up. Technically the 300 should be at the tail end of the glycolytic energy system but I never ran hurdles because I was a hobbit. 300 sprints still weren't as bad as the 400s.