Both of these phrases mean basically the same thing. Yahweh compares the king of Assyria to a weapon a person holds in his hand and hits other people with. It emphasizes that the king of Assyria and his army are a tool that Yahweh uses to punish Israel. AT: "who will be like a weapon in my hands that I will use to show my anger" (See: [[rc://en/ta/man/translate/figs-parallelism]] and [[rc://en/ta/man/translate/figs-metaphor]])
The word "him" here also refers to the king of Assyria. But it does not mean God is only sending the king; he is sending with him the army of Assyria. AT: "I send the army of Assyria ... I order them" (See: [[rc://en/ta/man/translate/figs-synecdoche]])
Yahweh speaks of his wrath as if it were more liquid than a container could hold; "the people" are trying to carry this container, but it is heavy, and Yahweh keeps pouring liquid in even after it starts to spill out. AT: "at whom I continue to be angry even after I have punished them" (See: [[rc://en/ta/man/translate/figs-metaphor]])
Possible meanings are 1) Yahweh compares the army of Assyria attacking Israel to people stomping through mud who do not care what happens to the mud. AT: "trample them until they become like mud" or 2) the people are stomping on other people so they are lying in the mud and unable to rise. This is a metaphor for completely defeating them. AT: "completely defeat them" (See: [[rc://en/ta/man/translate/figs-simile]] and [[rc://en/ta/man/translate/figs-metaphor]])
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