No, I mean the second modification of the Mk7, which I refer as Mod2.
Here is the corresponding text from Navweaps:
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A redesigned Mark 4. The redesign was to simplify the construction and took advantage of new production techniques developed since the end of World War I. This was the standard depth charge for USN ships early in World War II. Mod 1 (issued in August 1942) increased the maximum depth setting to 600 feet (183 m). A later version reduced the warhead to 400 lbs. (181.4 kg) TNT in order to add a lead weight which increased the sink rate to 13 fps (4 mps).
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The part from "A later version..." I think is refering to the Mod2.
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I am going by memory, but I think the Mk9 and the Mk9 Mod2 had slightly different explosive charges/blast radii, and I am pretty sure their sinking rates differed quite a lot. Conversely, the Mk9 and the Mk9 Mod1 shared the same characteristics.
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I have never heard from that, but I will search about that.
I also haven't knew the information about the fuzes before...