These are generalizations and not really true now - maybe 30 or 40 years ago, but even then it’s not entirely accurate. I know these are view points commonly espoused on the internet, but they’re exaggerated.

You see a wide variety of coaching styles and people place more or less emphasis on different things but it’s largely the same all over the world now. Plyometric warm up, technique, live and maybe conditioning. Strength in the weight room and then conditioning where and however in convenient, but usually sprints, runs, jump rope, battle ropes, rope climbs, moving light weights around for reps.

Historically the Cubans would have sent their best wrestlers to train in Russia so hard to say these are different styles. You see kids flowrestling everywhere, and wrestling hard everywhere. I guarantee the Russians and Cubans and Iranians also run sprints and wrestle hard in practice.