the similarities, they both take 700c wheels, they are both made from 4130. uhhhh...
roller is a track/road frame, cross check is unsuprisingly a cyclocross frame. so xcheck has slacker angles for slower steering, more fork rake, and weighs more as is designed for taking more hits, has braze on's for canti's or v brakes, more tyre clearance, mudguard eyelets, shifter mounts, and 132.5mm spacing for 130 or 135mm spaced hubs.
uh well, i'm pretty sure you can find out for yourself. http://surlybikes.com/frames/
but...
the similarities, they both take 700c wheels, they are both made from 4130. uhhhh...
roller is a track/road frame, cross check is unsuprisingly a cyclocross frame. so xcheck has slacker angles for slower steering, more fork rake, and weighs more as is designed for taking more hits, has braze on's for canti's or v brakes, more tyre clearance, mudguard eyelets, shifter mounts, and 132.5mm spacing for 130 or 135mm spaced hubs.