As far as I'm aware all of the VEA diesel engines are 2 litres. The V40 D2 between 2016 and 2019 was fitted with the D4204T8 engine at Euro 6 emissions level. From 2019 it was fitted with the D4204T13 engine at Euro 6D-Temp. Both have identical power output and torque.
Quoted CO2 figures aren't a fuel economy indication, but an allocated emissions rating which may affect tax bands. For non RDE2 cars the rates are £185 per year between 91 and 100g/km or £255 between 111 and 130g/km.
Cars were tested to the earlier RDE (not RDE2) standard from September 2019. Prior to that a different test was used. RDE2 only applies from 2021 as far as I'm aware, so not applicable for either car.
Probably the 2019 car was tested under RDE, whilst the 2017 car was tested under the previous standard.
Do both cars have the same transmission? I would also expect to see different CO2 levels quoted between manual and auto gearbox variants.
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