Acquafresca joins the Spanish side from Bologna on a loan deal, with Levante having an option to make the deal permanent in the summer.
Vyntra joins after being released by Panathinaikos and has signed a deal until the summer of 2014.
"I really wanted to get here," Acquafresca told Levante's official website. "There have been some problems but in the end they were all resolved.
"I hope to score many goals. I know the club and have many friends that have played here, such as Massimo Volta and Marco Storari. I have not spoken to everyone but I am told this is a great club."
Acquafresca struggled for goals at Bologna, netting just five times in 32 appearances.