They differ in one fundamental way:
Autotrophs fix their own energy. (They are the producers of the ecosystem.)
Heterotrophs must get their energy from other sources. (They are the consumers, detritivores, or decomposers of the ecosystem.)
All non carnivorous plants are autotrophs because they derive their energy from the sun through photosynthesis. They differ from heterotrophs in that they utilise carbon dioxide and not organic carbon sources.
A potato is an autotroph.
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Autotroph is not a verb and therefore does not have a past tense. Autotroph is a noun.