If you have enough patience push your second Snorlax first with 1766 CP. At the end it doesn't gonna matter that much but a reason enough even if the damage / defense will be slightly better than your Snorlax at 80%~84% CP.
If you care and really want a high CP Pokémon no matter what push your second Snorlax. Both will be bonkers and really annoying to get off. :)
I also have a Snorlax with 2433 CP at 96% IV with the same Moveset. He performs quite well in the Arena as a Defender for about 3 weeks right now and is still there.
I really wanted to push him during the Halloween Event but don't had another Snorlax, damn it! This Fatty will be huge in the future.