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I have both of those plants ambulia and myriophyllum matogrossense. I feel like the plant on the right is very "fluffy" and my myrio matogrossense that I have doesn't seem to get that fluffy.
Yeah from up close where you can easily see the morphology of the leaf structure, then yes I can see the differences. But from afar, the OP's picture does look at least similar to Myrio. But I'll concede and say it does look more like ambuila (a plant I never had). My myrio looked similar.