Character save files contain a LOT of info: current god spell ID, received at character creation, states of all containers opened, quest state values, weapon and armor model paths(!) in character inventory(!), which are assigned, when you pick them and don't change on the fly, despite itemtype.txt changes(!). Overall, Sacred 2 does not support character inheritance in mod iterations. It's not Diablo II(well, in fact D2 char saves would not load, if a single new global parameter was added in itemstatcost.txt). One should always be ready to lose that treasured char in transition.