Since the judges are in the US they will likely use the phones available there and that is the Snapdragon Note 4 and it was already mentioned that the phones will be on KitKat.
But if a game was developed and tested on an Exynos Note 4, you should probably mention that in the game description and they might find also an Exynos Note 4 somewhere in case there are problems on a snapdragon Note 4. But so far all games work on Snapdragon and only a few not on Exynos.