Alexander Pohla, who scored twice against Australia, moves to the left wing to accommodate the return of Ricky Pauli Ene at full-back with Godinet Tinei given the number nine jersey.
Samoa takes on Wales in its last pool game of the World Rugby U 20 Championship in Tablisi, Georgia on Thursday (local time)
Wales coach Jason Strange has freshened up his starting line-up for the match that they must win – ideally with a bonus point to avoid relegation to the second-tier U20 Trophy next year.