Should I flag it as a duplicate question, even though the parent of that answer is not the same language, or is some other flag more appropriate, or some other action the best?
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No, they're not duplicate questions.
Answers are not considered when evaluating questions as duplicates, and in this specific instance, the questions only bear a passing resemblance.
Your link is correct and does answer the question. I did flag that this question myself as a duplicate (though a duplicate to a different question than you did). I linked to another for the same language that the OP was asking about, but the ultimate response is the same.
I don't think it matters so much; if it is a duplicate problem and/or scenario with a duplicate answer, even with some a few differences, it's a duplicate.
Because there's been previous frowning upon removing C# tags for general .NET questions asked by C# users, almost all C# questions can be asked again as VB.NET (and F# and C++/CLI) questions.
But in this case they're clearly not the same Question, so no, these are not the duplicates you're looking for. (Clearly there is another duplicate question to point to.)