Originally Posted by
draciel
only the guard is different and a sword's guard is the easiest thing to change being that what Oro was going to teach Oro that time was swordplay or just give him the sword and when he says it's different he means cuz it can't be blocked and if you notice Oro's sword was always referred as quite sharp, a characteristic that Sasuke enhanced even further with his chidori making the blade unblockable.
Oro probably had some jutsus to make sure if he ever got separated from the sword he could retrieve it by activating some jutsu