I actually don't think it would have been much different. We probably would have gotten a few new books of theory. NEP might have lasted slightly longer, but the demands for collective land would have forced Lenin's hand to institute more rigid state planning like what happened in our timeline. The early USSR had such immediate hostility from all sides their policies were shaped by the besiegement. Don't know what would happen with Trotsky or Yezhov.

WW2 might have started a little earlier actually, since uh, Lenin wasn't exactly as polite or cautious in terms of diplomacy as Stalin was. He would have frightened the fascists and allies more than Stalin did. Lenin didn't take shit and he'd call out people to their face. The man was fierce and didn't hold back. He was incredibly brave, confident, and had the sharpest political mind of his time. Call me out for hero worship or whatever, but there's a reason Lenin has such a glittering reputation. The man was a fighter and I can easily see him pushing a more assertive international policy than Stalin did, especially once Germany goes fascist.