It seems like they were repurposed. Wouldn't the game take longer if they were scrapped and they had to start over from scratch?
I'm sure some assets might have been repurposed, sure. I guess the best comparison would be all the Versus remnants you'd find in the FFXV game code, like trashbag Noctis. But they work pretty fast at Square Enix, actually. Let's not forget that Tabata basically had FFXV developed from scratch when he took over. He more or less confirmed Versus to have been vapourware in interviews.