Rice averages 2.9 tackles, 1.6 interceptions, 0.5 fouls, 1.6 clearances, 0.4 shots blocked, 0.1 crosses blocked, 0.7 passes blocked, 0.6 shots, 0.8 successful dribbles,
3 aerial challenges, 46.4 total passes, 0.3 key passes
McTominay averages 1.3 tackles, 1.6 interceptions, 1.1 fouls, 2.2 clearances, 0.4 shots blocked, 0.0 crosses blocked, 0.4 passes blocked, 1.6 shots, 0.2 successful dribbles, 7.3 aerial challenges (noticed that Fellaini was at 8), 46.3 total passes, 0.0 key passes
So as you can see Rice makes over double the amount of tackles and dribbles a bit more.
Meanwhile McTominay fouls more, makes more clearances, has more shots and a lot more aerial challenges.
So Rice is more specialized in ball winning on the floor and defense, while McTominay is more specialized in winning the ball in the air and having a shot.