With IC is better, the compressed air from the turbo is cooled down so the engine stays cooler, less themal energy need to be disappated

a side-effect is that your enige will have more hp/tq

A JX van be fitted with a IC too if you can't find a RA/SB.
I don't know the exact difference between the JR 70hp (JX in the USA AFAIK) and the RA/SB 80hp engines is besides it has a watercooled turbo, IC and different partnumbers for the dieselpump.
Does anyone know what the exact differences are in je dieselpump/injectors/nozzles?
Small Q of my own about the 1.6TDs:
I have a JR in my shed which will be transplanted into my caddy.. but a friend owns a salvageyard where a RA/SB 80hp engine sits in a golf/rabbit with wornout bearings.. would it be worth swapping the injectors/nozzles and pump onto my JR?