@AlpinLuke
The more I look into this, the more stuff stands out at me, but the more stuff I need to carefully go over.
In the story of Yima, who gets a leper hand (Appearing in literature after the Avesta) and is part of a flood myth like Moses, and has a magic sword. He is tasked with giving out laws but passes on it, but then is made first King to rule over the world instead (Later is given as 4th shaw), which means he also had laws.
In his story, the earth is over populated and Yima makes the Earth swell numerous times to combat the overpopulation till Ahura Mazda warns him of a catastrophe. A horrid winter followed by snow melt (Presumably altered flood myth). He also had a magic 7 ringed cup that had elixir of immortality in it and ability to give visions. Yima may have adopted some of Manu's myth, like the flood. Or both figures are tied to the flood and why the mix up in stories.
In Hindu Vedic texts, Its Vaivasvata Manu (7th Manu). Who is visited by a fish who seeks his aid. So Manu puts it in a jar but the fish keeps growing too big. Manu swaps it into bigger and bigger containers till putting it in the ocean where it reveals its self to be Vishnu and warns of a coming flood. Manu is given Soma (Elixir of immortality by a Falcon). Yet I know of no story yet of Manu having a messed up hand, even in later literature. yet. Manu creates a series of laws though called the Laws of Manu.
Moses, like Yima, has a magic weapon of sorts, his staff. Like Yima, he has a leper hand. Unlike Yima being torn to pieces by Spitiyura, Moses parts Yam Suph. Which is closer to the Manu/Yemo myth in which its Manu who cuts Yemo. Moses also has the 10 commandments.
As per the Norse and Celtic versions. All 3 are compared to Mars via interpretatio Graeca, Nuada Airgetlam of Irish, and Lludd Llaw Eraint in Welsh from earlier Noden. Then Tyr. All 3 missing a hand, with one, Tyr, sticking it in the orifice of another being like Yima did.
Nuada is First King of the Tuatha De Danann, like Yima is first king in Avesta. Nuada also has a magic sword like Yima does.
Yima/Jamshid is followed by Zahhak, who is overthrown by Thraetona/Fereydun. Like Nuada being followed by Lugh Lamfada, who defeats Balor of the Evil Eye. (Which would suggest in Norse, that Tyr ruled before Fenrir bit his hand off, then rule passed to Loki when he killed Baldur).
Tyr is portrayed with a spear, like Greek Ares, while Mars is portrayed with a sword, like Nuada, and Yima. Moses and his staff seem rather more Greek and Norse like. Though I know of no story about Mars or Ares involving their hand being messed up. It does seem to suggest some God of War influence on the Moses story though. If some these other one handed figures are rightfully associated to Mars. Tyr fetches his father's cauldron for a feast which may relate to Yima's cup.
Moses has Manna, much like Manu's Soma, or Yima's Elixir Cup.
(I have in previous threads, talked about the association Manu has to the god of war, along with the god of death. Seen in archetypes matching manu, yemo, and trito. Like Tritos Zeus, his Sea brother Poseidon, and the god of death, Hades. Manu also being tied to the moon in pairings such as Mene (Selene), Helios, and Eos)
You're familiar with Egyptian myth. So I thought some of this may be of some help to you in figuring out which culture had an impact on the subject your dealing with.
Are these elements in the Battle of Kadesh poem? Or is this all Persian influence on the Moses story?