Can revealing module pattern be done without IIFE like this and serve same purpose?

My understanding of revealing module pattern is as follows:

CODE #1

const iifeModulePattern = (function () {
  const secretSeed = 999; // ← private
  const logSecretCode = function(){console.log(secretSeed+1)};
  return {methodForPublic : logSecretCode};
})();

iifeModulePattern.methodForPublic();

So far I hope I’m not wrong. My question is:

1. Won’t the following Code #2 serve same purpose?
2. If it does, why is Code #1 popular than Code #2?
3. If it doesn’t, what’s the difference?

CODE #2

const modulePattern = () => {
  const secretSeed = 999; // ← private
  const logSecretCode = function(){console.log(secretSeed+1)};
  return {methodForPublic : logSecretCode};
};

modulePattern().methodForPublic();

I won’t store “secret” codes (like passwords) in this way. The above codes are just examples.