Officially, no. Owning both games does give you more than enough animalfolk decks and junk cards to go way beyond 4 players, but we recommend strongly against it. We have found out that both games play best with 2 - 4 players. Adding more players significantly increases downtime and thus makes for a worse gameplay experience.
If you really feel like doing it, there’s nothing to stop you. Just keep in mind that the card effects are balanced around 2 - 4 players and thus some cards will be overpowered with more players. And the fact you need a lot of patience to wait for your turn.