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Well, anodes have always been referred to as "zincs". But, usually, they are a combination of different metals, not just zinc. I’m surely no expert on the chemistry involved here, but it is all a matter of where the different metals fall on the chemical nobility scale. You want your anode to be a more "noble" metal compound than the various parts on the lower unit of the outboard or stern drive. Seeing an anode that is eroded away is a good thing, means it is doing its job trying to protect the lower unit. An anode that does not appear to be eroding at all means it is not doing its job, or is crusted over preventing it from doing its job. Needless to say, this is more of an issue in salt water than fresh.
None of this really answers your question I guess. I guess I might give the Sierra "zinc" anode a try, the OMC piece is priced a bit high. I don’t think I would take a chance on the Sierra piece that is marked "magnesium"…..