Unworthy 616 Thor would most likely beat Thorlief, nevermind with Mjolnir.
If 616 Thor picked up 1610 Mjolnir, I don't think he'd somehow get 1610 Thor's body. I don't know what 616 Thor would get out of it, besides flight, the only thing I've ever really seen Thorlief do is manipulate the weather, which 616 Thor can already do, without Mjolnir.
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Besieged by countless foes, his eyes they are aglow, longing for the fight. He stands upon a mound, doesn't aim the throw, just lets the hammer fly!
It's weird seeing Galactus in pain though from an attack like that. Yet in Infinity we have Thor telling Thanos one of us will die today and then comes at him with a Mljonir strike looking just to annoy the character.
I feel like writers should look at what's been done in comics in terms of power tier and keep characters consistent and bend the plot to fit into it. If they wan a character to do something outlandish give them a amp.
I feel the same way. Lets take superior spiderman, in one issue Thor and Hulk are restraining him and commenting that they almost felt him move, few issues later, with the Symbiote he pretty much wrecks Thor who shouldnt even feel his best hits. It was horrible writing, all they had to do was take Thor /Hype/Hulk out of the picture and it would have felt like a legit threat and story to the Avengers.
The Justice Leaguebis more understandable as the entire team is high Herald/trans, but the Avengers need somewhat weaker enemies and should only bring out the Hulks and Thors for legit threeats.