When you recompute the interference results on the already existing data, you can expect the results based on the configuration selected.
If the interference specifications are changed between two computations, for a couple of parts (example: Check_No_Clash becomes Standard: Clash and Contact) the previous interference is removed and a new one corresponding to the new specification is created, then all users attributes on the previous interference are deleted.
If the interference specification doesn't change between the two computations, the standard comparison behavior is applied.