If you 'fit to print' it works printing double sided, but the cards end up smaller. At least it did for rove and sprawlopolis so I imaging this would be the same.
That is fair. I asked for A4 on one of their other games but just got replies like it doesn't matter that the size is smaller etc. But I still sleeve the pnp cards to help protect them and make it easier to shuffle. And then the sleeves are way to big.
So I didn't know if e are going to get A4 anytime soon. If you can be bothered going to the effort you can cut out the cards and recreate a file using this: https://boardgamegeek.com/thread/3662088/new-pnp-tools-card-formatter-and-card-e...