[Avodah] hava amina / mahu d'teima / salka datach amina

[Sholom Simon]

Is there a difference between hava amina, mahu d'teima, and salka datach
amina?

A guidebook I have (Understanding the Talmud, R Yitzchak Feigenbaum) says
they are "structurally" the same.  (He didn't say "equivalent" -- am I
being medayek where I don't need to be)?

Thoughts?

-- Sholom
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