No, I definitely don't think it'd be anywhere near high diff. MAYBE mid diff at most. That second part of your post is exactly why he'd lose. He doesn't know a think about Busoshoku Haki, while Zoro knows Enel is a logia. He's gonna get struck out of his arrogant ignorance, and it'll be a one-shot.Read it again, she only did it once by luck. Even admitted that she couldn't do the same again.
While that's true don't you think that he'll push him to high diff?
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enel was very unfamiliar with luffy's rubber ability, i mean come on if you could pass through people, don't you think that dogging would be the laast thing to think about? i thinknthat him thinking that logia are invincible somehow influenced his decision about dogging