Hi!
AFAIK, the stairmaker has not been updated in ArchiCAD13 , so there is no difference between the 12&13 version .
i think that you're talking about the stair library parts , when you open the stair options instead of creating stair, explore the librayr (left part of the window) and you should find the library stair objects.
AC12_27 |Win11_64bit|