there is There are only two diferences differences no chart needed
needed.
Potion has 1 sec of cooldown of use (spell has 15 seconds)
Potion costs 1 silver token each use (wich (which is very expensive) (spell cost 50 of mana and 450 gps in the npc just once)
everything Everything else is the same the amount of the shield, for how long it lasts, etc.