King Thor is even more powerful than Odin or Zeus, he has mastered both the use of Odin Force and Asgardian Runes, he'll be able to beat Post Crisis Darkseid without much troubles, he has infinite amounts of energy to tap into.
Magni is gonna beating down Kalibak even harder than his brother Orion did, he's stronger than Classical Thor with the hammer, FAR stronger, sufficiently to stay fist to fist with Desak and with Desak enhanced by Destroyer armor, this guy is really a powerhouse, and even with his limited mastery over Mjolnir he's gonna beating down Kalibak, not after a short fight but he'll do the job.
Beta Ray Bill VS Orion will be another tough fight, BRB is very strong and Stormbreaker is equal to Mjolnir, but Orion's powers are above those of Superman, and the Astro-Force is a very strong attack, this can be a stalemate unless Orion goes berserk and become too much for Bill, which can certainly manage to destroy the Astro Harness or damage it avoiding Orion from flying, also Bill going all out may be able to stay against a berserkerized Orion
I don't know who Grayven is.
Both Thor Girl and Hercules are above Big Barda, who's a low level Class 100 strenght possessor.
Orion will get thrash by beta ray bill have you seen him lately his fraking animal in stormbreaker. Even magni will beat orion and kailbak without breaking a sweat. And grayven is darkseid third son who looks just like him and he is just as strong as kalibak but he has some power of the omega beams expect for blink some one out of existence and highly skilled warrior.