Yes, you can play all the games available with the EA Play Pro subscription (all games in the ‘Pro Playlist’) fully for as long as you are subscribed. They also add the highest editions of EA games, not Standard. You’d however lose access to the games if your subscription expires.
There’s a list of the games available here >> https://www.origin.com/deu/en-us/store/browse?fq=subscriptionGroup😛remium-vault-games&sort=rank%20desc
Generally, if you are planning to buy two games like Madden and FIFA (Std edition), or the highest edition of one of those during the year, you can get EA Play Pro for the year for a similar price (check the price for your country) and get access to those games and more for as long as you keep the subscription. And one of the advantages of EA Play Pro is that you get access to EA games a few days before they release. With EA Play (not Pro) they are generally added to the subscription to play fully as well, but some months after release, not from the start.
Then again, you mentioned you aren’t interested in anything else than those two games, and you don’t care about the extras of the higher editions and such… so you might want to pay extra attention to the price difference. For me for example is a great deal because I like to try different games.