The phrase "closest analogy" refers to finding the most similar or comparable thing or situation to another thing or situation. It helps us understand something new by comparing it to something familiar. Full definition
I think it is a sober warning and a strikingly close analogy for what we are doing to the planet right now. (illconsidered.blogspot.ru)
Granting this does not mean, however, that churchly legal systems that function generally in close analogy to worldly structures of polity, even if indeed lacking police and means of physical coercion, are appropriate. (firstthings.com)
You might as well call nuclear our new Russian Gas — because that's a much closer analogy. (zerocarbonista.com)