No, unfortunately they are not located next to each other. The two closet resorts to Paradisus Palma Real are the Melia Caribe Tropical (which both are owned by Sol Melia Resorts) or the Eden NH Real Arena. Both of those resorts are cheaper options for those guests who find PPR a bit too pricey.
Keep in mind though that for your wedding day, a lot of resorts charge a visitor fee for a day pass (usually up until 6pm) and then for a night pass past 6pm. I know that the Melia Caribe charges $95 for a day pass and then another $95 for a night pass...it might be about the same since the PPR and Melia are owned by the same company.