Working from the gearbox end it's a bit difficult to see which pipe is which, but at the cooler end the attached drawing does show which is the inlet and outlet making the pipes easier to identify.
Having said that, the system is essentially a closed system, therefore both the pressure and flow of fluid should be much the same with only the temperature being different. So a blockage caused by a pipe being crushed, even partially will reduce the flow, immaterial which pipe has suffered damage.
This is were it’s been crushed. Think your right it all need replacing. Bloody expensive though.