The leaves in the top picture have a "sawtooth" edge to them very much like the lower leaves on hygrophila difformis, aka water wisteria, that get less light than the top of the stems. I'd bet that that's what you have.
I just removed literally half of a 26 bowfront's worth of wisteria that all grew from one salvaged 6" petsmart stem. It's leaf shapes ranged from the typical highly exaggerated fine leaves that wisteria is known for, ranging from 2"-5" per leaf, to what you see in the op's picture along with completely smooth edged leaves and it seemed that leaf shape was not relative to light intensity . Emersed form is pretty cool too. You will know for sure though once it becomes established.
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