That's a crazy looking Nurii leaf bro. It don't look anything like any Nurii I've ever grown, for sure.
The small leaf, yes. The large leaf, I would probably call it a wendtii myself if I didn't know. Could it be that you're growing these two plants next to each other and the wendtii is having some sort of genetic influence on the Nurii? Is that even possible? lol
Go look at the pics of the wild nurii it looks a lot like that leaf, my guess is it's how it grows under high light, I have some other nurii 'pahang mutated' from tissue cultures that I'm going to put in there and see what it does, it's emersed right now so I should be able to see what leaves it forms as it transitions, I'm hoping the affinis "red metallic" I just got looks like it does in the wild as well..