Similar size yes, but different styles. Crowley is more of your traditional bigger back w/long strides. The classic one cut slasher who will punish in open field and once he gets going really has deceptive speed for his size. Stretch runs will suit him best as moves further up in the career. Lacks wiggle but that's no surprise at his size. Is okay out of the backfield, but you can tell he's not a natural catcher & will fight the ball. Great frame, big lean kid who once is in a college weight program will be a monster physically. Think Eddie George in terms of playing style (not saying he's Eddie George, but styles are similar).
McIntosh has elite balance and feet. He's a rare pocket runner at his size (Sanders is as well), which makes them both so unique. He can run too high at times, which most bigger backs do when they're younger, but because of his balance & feet he gets away with it. He's an explosive athlete - quick twitch and sudden. The reported 40 times are a head scratcher because he is an explosive athlete, not sure if they're from bad timing or he's just never really trained to run (Not saying he'll ever run in the low 4.4s, but with the type of athlete he is he should be in the 4.45-4.55 range). Normally being a pocket runner at his size would have me most excited, but it's his ability out of the backfield that is most impressive. He has exceptional hands, but he also runs great routes. Looks as if he's trained with WR groups. Big kid, who from all things we know seems to be a hard worker w/a good head on his shoulders, but if he got lazy he has the type of frame that could blow up on him.
Both are very good, but in terms of style they are different players. I'm very happy w/Crowley already on board, but the two potential crown jewels of this class at the position are Sanders & McIntosh.