Hi Georg II
Is each item only assigned to one of the two dimensions, or do they load on both?
If each item is assigned to only one dimension, you could have a look at a scatter plot between the item parameters of the two models. I expect you'll see two lines, one for each dimension. The default in ConQuest is to constrain items, which means that the average item difficulty is set to zero for each dimension. Hence there is a shift in item difficulties for each dimension.
Eveline