Is that correct?
It's been claimed elsewhere that the schedule problems with the freighter are based on factory-construction problems in Hamburg, not "weight", as others have conjectured.
This tells me that freighter delivery slots and passenger delivery slots are not interchangable.
That would only be a factor if the passenger line were running to capacity; it's not. The limitation is getting the parts from the suppliers. Building assemblies for the freighter version that then have to be transported takes away resources from building parts for the passenger model. Also the freighter program was taking engineers away from fixing problems with the initial passenger variant.