Looking at Rimmer's website, they do say up to a certain VIN for that hose, so I think its for all cars, whereas there is a different section for hoses associated with the thermostat, which is different between the cars.
Yes, 14 is part of 15, which is coolant house PEH000090. It is confusing.
I'm working at converting parts microfiches for 1997 and 1999 into pdf, hoping that confusions like this will be made clearer by being able to look at these different microfiches and see what part was superseded by another.