The former lightweights will face each other on April 14 in Stockholm, Sweden, UFC officials told Swedish website MMANYYT.se on Wednesday.
Siver (19-8) will be competing at 145 pounds for the first time in his professional mixed martial arts career. He revealed his decision to move down a weight class in October, following a first-round submission loss to Donald Cerrone at UFC 137.
Pearson made his featherweight debut on Dec. 30 at UFC 141. After struggling in the opening round, Pearson (13-5) found his rhythm in the second and third rounds to earn a unanimous decision over highly touted Junior Assuncao.
During their first encounter, Pearson and Siver put on a "Fight of the Night" performance. Pearson came away with a unanimous decision in the hotly contested bout.
Franklin McNeil covers mixed martial arts and boxing for ESPN.com. Follow him on Twitter at www.twitter.com/Franklin_McNeil.