The game rules don't make a distinction between different types of bolts. Although a hand crossbow bolt realistically shouldn't be the same size as a regular crossbow bolt, I personally wouldn't bother to differentiate them - like Bill Zebub said, nobody bothers to determine whether or not found armor will fit a character.
(Besides, if you're going to start doing that, you should also be hitting regular archers with the same rules and require arrows to be of the correct draw length for the character's bow.)