I thought both of them were catches. In both cases, the receiver caught the ball, established possession, turned, and took two steps. To me, turning and taking two steps constitutes a "football move". Neither receiver was making a diving catch, and it's the diving catch that requires the receiver to maintain possession after hitting the ground.
At least the refs were consistent and called them both incomplete. It actually worked in the Bills favor, since we scored a TD on the next play, where Denver's no-catch ended a drive.