Is the 2 day Origin Trial the full game?

You can refund a game within 24 hours: https://www.origin.com/en-nl/great-game-guarantee

The difference between the normal game and the deluxe is:

• Life of the Party DLC – New costumes and Flaming Tiki Bar
• Up All Night DLC – New Outfits, parties, decorations, recipes and a laser light show
• Digital Soundtrack
• Awesome Animal Hats DLC – Exclusive to Origin, includes animal themed hats

Source: http://www.gamekeysnow.com/the-sims/questions/25-what-are-the-differences-between-the-sims-4-editions