Guhle, who captained the Raiders, helped Canada claim a silver medal at last year's event in his hometown of Edmonton with three points (2 goals, 1 assist) in seven contests.
He was selected 16th overall by Montreal in the 2020 NHL Draft.
Roy, 18, has been an offensive machine for the QMJHL's Sherbrooke Phoenix this season.
The speedy forward, who hails from Saint-Georges-de-Beauce, QC, currently leads the League in scoring with 39 points (14 goals, 25 assists) in 21 games.