Thought I had a understanding on how a BOM is created inSolidWorks, now I think I am wrong?

We have situation that there is different models because ofconstruction (appearance). However they have the same configurationname, different property name.
In the BOM they are being grouped together as one line item. Isthis because of how SWX looks at file structure? Or is it justbecause of same configuration name but in different files?SolidworksBill Of Materials