I don't know what the main differences are when it come to Canadian style ball in comparison to American, but to my knowledge I'll give it a go.
A field corner generally is more of a speeds and smarts that can be left on island (i.e. the Revis island.)
A boundary corner is more of your physical freak where they prefer to get in a tackle when it comes to running the ball and so forth, so more aggressive and they are generally allowed to hence why they have the FS on this side of the field as well.
Defensive scheme would only change unless to goes a front 6 (i.e.4-2-5 like UNC will be running this year, or 3-3-5)
Physical characteristics hmm not so much you can hope but generally its more of a type of player.
A good example would have been LSU this past season, Tyronne Mathieu was boundary , meanwhile Claibourne was field.