>> Did you read the rest of the discussion about differences?
> I did. My point is we are not comparing apples to oranges.

And?  What about the CHEMICALLY related part?

One could argue that water (H20) and Hydrogen sulphide (H2S) are 
chemically related, but they are very different in most respects that 
matter to us.

A difference of one atom in a chemical can make a huge difference in its 
properties.

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