To quote Your Story "a block is a block is a block".
Mechanically all of those methods of pickpocketing are equivalent, except (and this is important) different flavor allows or prevents aspects from being invoked in support of or compelled to counter the attempt, or different skills or powers to come into play. A spirit used to pickpocket might be defeated by Ghost Sight or might allow Lore to spot the attempt instead of Alertness, for example, or the fact that the item in question has the aspect "painted in ghost dust" might foil the attempt.
So using a pickpocket spell to disarm somebody probably can't make use of anything built into it to distract attention from the fact that the item is now gone (they'll notice they're no longer holding a weapon) but might conceal where the weapon went (if it was teleported somewhere rather than flung there with TK) or who was responsible for the disarming.
