Edit: Multiple users are saying you can use the vouchers on any movie as they are generic. Also, I believe you can only claim 4 tickets to your associated Origin email address.
I'm not sure if this is targeted but I received an email from Origin to redeem a free double pass to see either Despicable Me 4 or Inside Out 2 with promo code 'OriginWinterHolidays' through their website https://www.originmovies.com.au/.
I have already claimed for both movies and received the vouchers to my email and booked the movies through Event Cinemas. I'm not sure if there is a limit or if it's until they run out.
Haha sadly